Pho3nix
The Legend
For multi-user support to work each user must create a MyPlex account, you then share which sections you want them to have access to from your servers page on the MyPlex page (https://my.plexapp.com/). Once you have done this then when that user logs in they will see what sections you shared with them and they will also have their own play progress status and On deck items, etc.
Hope this helps.
Thanks but just one more question, I take it the other users don't have to be Plex subscibers and only I should be one?