add commands in: Admincommands.cs (find location yourself)
when you've added the command you want go to player.cs(find location yourself)
find: case:"owner" or something like that, and add a new case below owner. owner rank should be common as the 8th rank on most servers. Make a new case on a new line below owner and call it whatever you want to. And change the case number to 9. Go back to admincommands and find your command(s) and find the "required.rank:" inside your command and set it to the rank you want it to be used on..
-enjoy