Wheel group (su)The Wheel group is a user group that can gain access to root on your server by using the su command (create a shell with the entered user id). You can add and remove users from that group as required.
To add a user to the Wheel group:
Click on the Add/Remove Users from the Wheel Group (allow su) link in the Server Setup menu.
Click on the required user in the displayed list and click on the
button.

Topics:
Removing a user from the Wheel group