How to Redeem Apple TestFlight Invitation Code?

so to redeem apple test flight invitation code what you need to do is just go to test flight app and tap redeem in top right and then this is where you can enter your test flight invitation code and then if you do that basically it should be provided to you by the app developer you just enter that and then you'll be able to to get access and install the test the beta version of the app you want to try out so for example here it is and then you for example i just have this app i can see the beta program website and then i can just install it and try it out