What you need
The login of the user (BEXXX,...)
The email of the user
The site code
The buildings codes (not mandatory)
Steps
Go to the Add or Edit users page

Click on the button Add New User and fill the fields like this:


Note: you can filter on building (VPA Building Code List) and/or site (VPA Site Code List) to limit the visibility to the user. Add NULL string in the list to allow the user to see people not localized.
Click on the Save button:

Archibus