to add new users from the admin backend:
All Fields Listed are REQUIRED by the system.
1) goto admin > tools > users > add new
2) goto 'Info.' tab
- fill out name
- phone
- mobile
3) goto 'address' tab
- fill out address line 1
- address line 2
- city
- postcode / zip
- state
- country
4) goto 'System' tab
- in username, enter their email address
- in 'reset password' enter a password for the user
- in account type pick admin, mod, supplier or wwwUser
- tick the 'live' box
Email addresses are unique per user;
if the user already has an account in the system (eg from a frontend signup) then you will not be able to create the user again using the admin section
you will have to find the user in the tools > users list and modify their user level if needed.
See also: fixing user login problems