how do I get my Iphone App working correctly

your question as written is very vague.. I'm going to take a guess that you are asking about the 'find my' app?

Set up Find My on your iPhone, Mac, AirPods, or other devices - Apple Support

I wouldn't have guessed it however after thinking about it, you have made a brilliant assumption. You are better at the guessing game than I am and by far.

Axel F.

Yeah ha ha :) Just the way it reads it kinda popped into my head that way. But still a complete guess. Might not ever find out