What Levi suggested should take care of the issue. I'm guessing, if you don't see the Users under the local Server name, you probably get the users under "WORKGROUP" name (At least this is what I experienced when we started using the early QS version).
If none of the above works, could you provide a screenshot of the followings, it might be helpful to visualize what's missing:
1. 1-2 users name you have listed in the Local User List directory (if possible the exact SERVER name as well)