Hi Max,
If everyone is logged in as themselves the pop up window will not appear as this is only for the 'student' account.
When they are logged in they should see the papercut balance onscreen (normally in the top right corner - like the picture below).
If you can't see this please run the papercut program in applications.
Once this is on screen the students/you should be able to print directly to the followme-mac queue and pick it up from any FollowMe Mac enabled printer.
