specify user access

Demo: allow or deny user access.  Check users access

fill out carefully form field username, or use registered user list at the right frame

click username in the registered users list , then button Specify user access   registered users::     help::

[Type only username:] username first name last name e-mail

Now username form field is undefined.   Type in username into the form field   Or view the list of registered users   and click on the  username field: .