You can edit Settings from Test center.
Below test center settings, Rooms, Users and Groups are listed. To create a new room, click Create room and fill out the requested details. You can edit these values by clicking on one of the rooms. To delete a room, click Remove room and confirm.
If you click on the tab Users you will find all admins in your test center. It is possible to send login credentials to an admin when e-mail address and/or mobile phone number has been added. Click Send credentials.
This will also reset the password.
To Remove user, simply click on the button and confirm.