Superadmin is a rank in ULX that provides you with access to all of the ULX commands.
You will need both ULX and ULib installed on your Garry's Mod server, you can install these directly from our Mod Manager.
ulx adduser name superadmin. Replace
namewith your Steam username.
!menuin chat and it will bring up the ULX menu containing all the commands you now have access to.