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:
Locate the Profile icon in the app and tap on it.
Next, 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.