Before you need to login the admin interface.

To prevent a user from viewing any page of your board, go to Users > Ban User.
To ban a user, specify:
  • User Name – the name of the user to ban.
  • Move User to Usergroup – the usergroup to move this user to. This usergroup should have reduced permissions, if any at all.Note:
    Only usergroups that are specified as banned groups will be displayed here.

  • Life Ban After... – the ban’s length. This ranges from 1 day to 2 years to permanent.