Moderating
To define someone as an admin, or a moderator on your server simply type into the server console
moderatorid 76561197960279927 garry
or
ownerid 76561197960279927 garry
Where the number is the 64bit steamid of the person you want to add, and the name is the name of the user. The name is only used for your reference - it can be anything you want.
People added using ownerid will be able to define other moderators and owners. That's the only difference between the two right now.
Next time you join the server you will see that you have been made an admin, and you can send console commands to the server (F1) just like you were sitting at the console. You will also be able to use admin commands (like inventory.give).
You will find as admin that by default you get some special abilities.. like instant/free craft. At the moment these things are mandatory - but we will endeavour to make them optional in the future.
Your users are stored in <identity>/cfg/users.cfg