You don't "set-up" any specific command. All you do to get admin is :
Step 1: Find your STEAMID
To find your steamid, go inside your server or any server, and in the console ( the ~ button next to the 1 key ) and type :
Your steamid is the thing that looks like : STEAM_0:0
5124 ( but with different numbers ofcourse... )
Now write that down somewhere
Step 2: Add yourself ( or a friend ) as an Admin
Go to your : amxmodx/ configs folder, and open the
Users.ini file, and type in at the bottom!
Code:
"STEAMID" "" "abcdefghijklmnopqrstu"
Above where it says "STEAMID" replace that with the steamid(s) you wrote down, and leave the QUOTATION MARKS AROUND IT!!!
Step 3: You are done, abuse some noobs...
Good luck...