Bitcoin.org wallet is no longer available for iPhone.

I installed bitcoin.org two years ago. Now when I try to open it, I get a message saying that the app is no longer available in the App Store (iPhone users). There is no information other than the actual receipt you receive each time you deposit money. I tried downloading the same app, but it no longer exists. I tried to download another app and it asks for wif and I don’t know what it is. And I can’t find what my wifi is because I can’t access the app.

I need to cash out some money, but I can’t because the app isn’t working. What should I do and who should I contact?