Add Remote Users to a Server Computer

[Ash Zidan]

Of course for windows accounts
The issue my friend is that I have a windows server 2008 on a LAN
and I want to create groups and add users from other computers on that LAN to these groups...
What I really face is the absence of the other location when I click Locations to add users from.
These are the steps i do:
Computer(right click)->Manage->Configuration->Local Users And Groups->Groups->(right click)->New Group->Add->Locations!
here is the problem!! No locations but the server itself!!!