What is UserNo?
UserNo is a unique identification number for your account. A UserNo will be issued automatically once you install and run the app. You cannot change a UserNo once it has been issued. If you already have an account and sign-in to your account, the UserNo will be changed to the UserNo designated to your account.
If you create an account while you are in guest mode, the UserNo generated during guest mode will carry over to the account you've created. Regarding guest mode, please refer to the following: What is Guest Mode
Checking your UserNo