Set Username 
Autor: Steve A.
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How do I set a username for visitors to login? I do not want to use an email address. How do I display Username at the top of the login field, and how do I assign a username to a new user?
Thanks
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You need to use an email adres, just for safety.
You can use a fake/self made up email adress if needed. But you need an @ an a dot in the mail adres.
see also the guide:
https://guide.websitex5.com/en/support/solutions/articles/44001269647-how-to-create-a-members-area-and-define-access-to-it