You can sign up for a 1SE account using an Apple ID or a Google account or by entering your email and password. If you choose to register with Apple, follow these steps:
Tap the Profile tab.
Tap Create Account or Sign In.
Tap Continue with Apple.
Choose Share My Email to use your email address or Hide My Email to opt for a private one.
Tap Continue to finish.
Creating a 1SE account will not delete or replace data in your app.
