One login for everything you do in Booster RH.
Signed up in the app with Sign in with Apple? Keep signing in there for now — Apple sign-in is still coming to the website. Signing up here with your everyday email would start a second account, without your club in it.
If Apple offers to hide your email, choose Share My Email. Hiding it gives Booster RH an address you'll never see, and signing up later with your real one would start a second, empty account — without your club in it.