screens/HomeStack.js

import React from 'react';
import {createNativeStackNavigator} from '@react-navigation/native-stack';
import FeedScreen from './FeedScreen';
import ProfileScreen from './ProfileScreen';

const Stack = createNativeStackNavigator();

function HomeStack() {
  return (
    <Stack.Navigator>
      <Stack.Screen name="Feed" component={FeedScreen} />
      <Stack.Screen name="Profile" component={ProfileScreen} />
    </Stack.Navigator>
  );
}

export default HomeStack;

화면 등록 후에는 PostCard에서 사용자 정보 영역을 눌렀을 때 ProfileScreen을 열어주도록 수정하세요.