It's not necessary to use TestFlight to test your app, instead we recommend using debug builds and installing to your device.

If you'd like to use TestFlight, here are the steps.

  1. Complete all steps for iOS app store submission, including generating certificates and creating your app store listing.
  2. Add app testers in App Store Connect by visiting your app, click TestFlight, then Internal Groups => Testers. 

  3. Run a "Submit to iOS app store" build on the Build tab of the app customizer.
  4. When your build is done processing, it should be available to test. You can check the status in App Store Connect under your app => TestFlight => Builds.

All testers will need to download the TestFlight app and enter their login. More information: https://testflight.apple.com/