To let your users log in on their own to your computers,
  • In Settings screen, Click "Usergroups"

 

  • Select the Usergroup.

 

  • Tick the "Allow Login" checkbox.

 

  • Click "Options" under Client Settings.

 

  • Tick the "Can Login" checkbox.

 

The users under that Usergroup can now log in on their own to your computers.