The Login/Register Screen allows new account creation using either a platform key (Passkey) or security key.

NOTE: The username must be unique when registering a new account.

A new account registered via Passkeys can be authenticated using FaceID or TouchID.

A successfully registered user is taken to the Key Management Page, where keys may be added or removed.

Add keys to the account by clicking Add Key.

Label the key. If a platform key is already registered, it can only register additional security keys. The platform key will sync across other Apple devices using same Apple ID via Passkeys in iCloud Keychain.

If no platform key is registered, the current device can be added as one.

Delete an existing key by tapping the menu button on key to be removed, or by long pressing the list item (Blue Key in the image); then tap Delete.

Delete the account by tapping the Settings icon in the top right, then tapping Delete Account.