Deactivate a User
If you want to prevent a user from accessing the Server there are 2 options to do so.
Curators (Server admins) can deactivate users. Deactivated users can't access the Server. To deactivate a user go to the User Management page in the Server Admin interface. Select the user and uncheck the Active setting.
Note
This setting does not exist for the Integrated Windows Authentication.
You can also change the user's role to No Access.
You can't delete a Server user's account.