diff --git a/__mocks__/api.ts b/__mocks__/api.ts
new file mode 100644
index 0000000..7cddfdc
--- /dev/null
+++ b/__mocks__/api.ts
@@ -0,0 +1,38 @@
+// __mocks__/api.ts
+
+import { language_matrix, language_matrix_entry } from "@/app/i18n/api";
+
+// Import the actual API module to extend its functionality
+const origApi = jest.requireActual('@/app/i18n/api.ts');
+
+class LanguageServer {
+  constructor(...args: any[]) { }
+  fetchLanguages(): language_matrix {
+    return {
+      "en" : { code: "en", name: "English", targets: ['fr', 'es'] },
+      "fr" : { code: "fr", name: "French", targets: ["en", "es"] },
+      "es": { code: "es", name: "Spanish", targets: ['fr', 'en'] },
+    }
+  }
+}
+
+class Translator {
+  constructor(...args : any []) {}
+  translate(message : string, target : string) {
+    return message;
+  }
+}
+
+class CachedTranslator extends Translator{
+
+}
+
+module.exports = {
+  ...origApi,
+  LanguageServer,
+  Translator,
+  CachedTranslator,
+  // Mock the specific functions you want to override
+  fetchData: jest.fn(() => Promise.resolve({ data: 'mocked data' })),
+  // Add more mock implementations as needed
+};
\ No newline at end of file
diff --git a/app/i18n/api.ts b/app/i18n/api.ts
index e25701b..c81a3a7 100644
--- a/app/i18n/api.ts
+++ b/app/i18n/api.ts
@@ -83,6 +83,12 @@ export class Translator {
         console.log(data)
         return data.translatedText
     }
+
+    static async getDefault(defaultTarget: string | undefined = undefined) {
+        const settings = await Settings.getDefault();
+        const source = await settings.getHostLanguage();
+        return new Translator(source, defaultTarget, await LanguageServer.getDefault())
+    }
 }
 
 export class CachedTranslator extends Translator {
diff --git a/app/index.tsx b/app/index.tsx
index 8095b75..96f6119 100644
--- a/app/index.tsx
+++ b/app/index.tsx
@@ -4,6 +4,7 @@ import { Image, Text, View, StyleSheet, Button, Pressable } from "react-native";
 import { LanguageServer, Translator, language_matrix_entry } from "./i18n/api";
 import { Conversation } from "./lib/conversation";
 import { LanguageSelection } from "@/components/LanguageSelection";
+import { Link } from 'expo-router';
 
 function LogoTitle() {
   return (
diff --git a/components/ConversationThread.tsx b/components/ConversationThread.tsx
index b2ff8e0..6972f58 100644
--- a/components/ConversationThread.tsx
+++ b/components/ConversationThread.tsx
@@ -67,6 +67,7 @@ const ConversationThread = ({ route } : {route?: Route<"Conversation", {conversa
 
   return cachedTranslator ? (
     <View style={{ flex: 1, flexDirection: "column" }}>
+      <Text>Conversation Thread</Text>
       <ScrollView
         style={{
           borderColor: "black",
diff --git a/components/LanguageSelection.tsx b/components/LanguageSelection.tsx
index 82cff94..4026885 100644
--- a/components/LanguageSelection.tsx
+++ b/components/LanguageSelection.tsx
@@ -1,4 +1,4 @@
-import { CachedTranslator, Translator, language_matrix, language_matrix_entry } from "@/app/i18n/api";
+import { CachedTranslator, LanguageServer, Translator, language_matrix, language_matrix_entry } from "@/app/i18n/api";
 import { LIBRETRANSLATE_BASE_URL } from "@/constants/api";
 import { useEffect, useState } from "react";
 import ISpeakButton from "./ui/ISpeakButton";
@@ -7,17 +7,19 @@ import { ScrollView, StyleSheet, Text, View } from "react-native";
 import { SafeAreaProvider, SafeAreaView } from "react-native-safe-area-context";
 import { Conversation, Speaker } from "@/app/lib/conversation";
 import { NavigationProp, ParamListBase } from "@react-navigation/native";
+import { Link } from "expo-router";
 
 
 export function LanguageSelection(props: {
   navigation?: NavigationProp<ParamListBase>
   translator?: Translator
-  onLangSelected? : (lang : language_matrix_entry) => any
+  onLangSelected?: (lang: language_matrix_entry) => any
 }) {
   const [languages, setLanguages] = useState<language_matrix | undefined>();
   const [languagesLoaded, setLanguagesLoaded] = useState<boolean>(false);
 
-  const translator = props.translator || new CachedTranslator("en")
+  const languageServer = new LanguageServer(LIBRETRANSLATE_BASE_URL);
+  const translator = props.translator || new CachedTranslator("en", undefined, languageServer);
 
   function onLangSelected(language: language_matrix_entry) {
     props.onLangSelected && props.onLangSelected(language)
@@ -28,7 +30,7 @@ export function LanguageSelection(props: {
     const fetchData = async () => {
       try {
         // Replace with your actual async data fetching logic
-        const languages = await translator.fetchLanguages();
+        const languages = await languageServer.fetchLanguages();
         setLanguages(languages);
         setLanguagesLoaded(true);
       } catch (error) {
@@ -41,20 +43,25 @@ export function LanguageSelection(props: {
   }, []);
 
   return (
-    <ScrollView >
-      <SafeAreaProvider >
-        <SafeAreaView>
-          {(languages && languagesLoaded) ? Object.entries(languages).filter((l) => (LANG_FLAGS as any)[l[0]] !== undefined).map(
-            ([lang, lang_entry]) => {
-              return (
-                <ISpeakButton language={lang_entry} key={lang_entry.code} onLangSelected={onLangSelected} />
-              );
+    <View>
+      <Link href={"/settings"}>
+        <Text>Settings</Text>
+      </Link>
+      <ScrollView >
+        <SafeAreaProvider >
+          <SafeAreaView>
+            {(languages && languagesLoaded) ? Object.entries(languages).filter((l) => (LANG_FLAGS as any)[l[0]] !== undefined).map(
+              ([lang, lang_entry]) => {
+                return (
+                  <ISpeakButton language={lang_entry} key={lang_entry.code} onLangSelected={onLangSelected} />
+                );
+              }
+            ) : <Text>Waiting...</Text>
             }
-          ) : <Text>Waiting...</Text>
-          }
-        </SafeAreaView>
-      </SafeAreaProvider>
-    </ScrollView>
+          </SafeAreaView>
+        </SafeAreaProvider>
+      </ScrollView>
+    </View>
   )
 }
 
diff --git a/components/TTNavStack.tsx b/components/TTNavStack.tsx
index ceb1a9a..f9130c4 100644
--- a/components/TTNavStack.tsx
+++ b/components/TTNavStack.tsx
@@ -2,16 +2,38 @@ import * as React from 'react';
 import { NavigationContainer } from '@react-navigation/native';
 import SettingsComponent from '@/components/Settings';
 import { LanguageSelection } from '@/components/LanguageSelection';
-import { createNativeStackNavigator } from '@react-navigation/native-stack';
+import { createNativeStackNavigator, NativeStackNavigationProp } from '@react-navigation/native-stack';
+import {
+  useNavigation,
+} from '@react-navigation/native'
 import ConversationThread from '@/components/ConversationThread';
+import { language_matrix_entry, Translator } from '@/app/i18n/api';
+import { useRouter } from 'expo-router';
+import { Conversation } from '@/app/lib/conversation';
+import { Settings } from '@/app/lib/settings';
+import { RootStackParamList } from '@/navigation.types';
 
 const Stack = createNativeStackNavigator();
 
 export default function TTNavStack() {
+
+
+  async function onLangSelected(lang: language_matrix_entry) {
+    const nav = useNavigation<NativeStackNavigationProp<RootStackParamList, 'ConversationThread'>>();
+    const settings = await Settings.getDefault();
+    const hostLanguage = await settings.getHostLanguage();
+    const conversation = new Conversation(
+      (await Translator.getDefault(lang.code)),
+      { id: "host", language: hostLanguage },
+      { "id": "guest", language: lang.code, }
+    )
+    nav.navigate("Conversation", { conversation, })
+  }
+
   return (
     <NavigationContainer>
       <Stack.Navigator initialRouteName='LanguageSelection'>
-        <Stack.Screen name="LanguageSelection" component={LanguageSelection} />
+        <Stack.Screen name="LanguageSelection" component={({ ...props }) => <LanguageSelection {...props} onLangSelected={onLangSelected} />} />
         <Stack.Screen name="ConversationThread" component={ConversationThread} />
         <Stack.Screen name="Settings" component={SettingsComponent} />
       </Stack.Navigator>
diff --git a/components/__tests__/index.spec.tsx b/components/__tests__/index.spec.tsx
index b551182..b576561 100644
--- a/components/__tests__/index.spec.tsx
+++ b/components/__tests__/index.spec.tsx
@@ -1,17 +1,11 @@
 import {dirname, resolve} from 'path'
 import React from 'react';
-import { fireEvent, render, screen } from '@testing-library/react-native';
-import { NavigationContainer } from '@react-navigation/native';
+import { act, fireEvent, render, screen } from '@testing-library/react-native';
 import { createStackNavigator } from '@react-navigation/stack';
-import TTNavStack from '../TTNavStack';
 
-// Mock the expo-file-system/next module
-jest.mock('expo-file-system/next', () => ({
-  File: jest.fn(),
-  Paths: {
-    join: jest.fn(),
-  },
-}));
+jest.mock("@/app/i18n/api", () => require("../../__mocks__/api.ts"));
+
+import TTNavStack from '../TTNavStack';
 
 const Stack = createStackNavigator();
 
@@ -23,15 +17,19 @@ describe('Navigation', () => {
 
   it('Navigates to ConversationThread on language selection', async () => {
     render(<TTNavStack />);
-    const languageSelectionText = await screen.findByText("Language Selection");
-    fireEvent.press(languageSelectionText);
+    const languageSelectionText = await screen.findByText(/I Speak French\./i);
+    act(() => {
+      fireEvent.press(languageSelectionText);
+    })
     expect(await screen.findByText("Conversation Thread")).toBeOnTheScreen();
   });
 
   it('Navigates to Settings on settings selection', async () => {
     render(<TTNavStack />);
     const settingsButton = await screen.findByText("Settings");
-    fireEvent.press(settingsButton);
+    act(() => {
+      fireEvent.press(settingsButton)
+    })
     expect(await screen.findByText("Settings")).toBeOnTheScreen();
   });
 });
\ No newline at end of file
diff --git a/navigation.types.ts b/navigation.types.ts
new file mode 100644
index 0000000..05bc7c2
--- /dev/null
+++ b/navigation.types.ts
@@ -0,0 +1,11 @@
+// navigation.types.ts
+
+import { ParamListBase } from '@react-navigation/native';
+import { Conversation } from '@/app/lib/conversation';
+
+export type RootStackParamList = {
+  LanguageSelection: undefined;
+  ConversationThread: undefined;
+  Settings: undefined;
+  Conversation: { conversation: Conversation };
+};
\ No newline at end of file