Manual Installation for windows on latest RN

[RedZepplin]

This is probably a stupid question, and I apologize in advance for my own naivety,

Instructions I'm following
https://www.npmjs.com/package/react-native-localization#manual-installation-windows

I've been trying to do the manual installation for windows, but can't for the life of me get it right, managed to get through the first 8 steps without a hitch, but the last part:

Open MainPage.cs
Add the new ReactNativeLocalization.RNLocalizationPackage() to the Packages list in MainPage.cs

I can't seem to find MainPage.cs, the closest thing I can find is MainPage.cpp which I am assuming is a C++ variation of the same file. despite this I have tried everything I can think of including #include to add this to the packages list, please any form of guidance would be greatly appreciated

MainPage.cpp
`#include "pch.h"
#include "MainPage.h"
#if __has_include("MainPage.g.cpp")
#include "MainPage.g.cpp"
#endif

#include "App.h"

using namespace winrt;
using namespace Windows::UI::Xaml;

namespace winrt::FrappePOS::implementation
{
MainPage::MainPage()
{

    InitializeComponent();
    
    auto app = Application::Current().as<App>();
    ReactRootView().ReactNativeHost(app->Host());
}

}
`