Help, how do i set me as admin on my underdone?!?!

Hey guys, i just got working version of underdone, i just need to know how the hell i set me as admin!??!? Tell me please. I will be in really good mood if i get something information about setting me in underdone as admin.

garrysmod/garrysmod/settings/user.txt


"Users"
{
	//
	// This is your users file
	//
	// You can use this file to add people as admins on your server
	// Add them to the relevant section
	//
	// If you're a Lua coder you can add your own sections and use them
	// in your script by doing pl:IsUserGroup( "admin" ) etc
	//

	"superadmin"
	{
		"<SteamName>"	"<SteamID>"
	}
	
	"admin"
	{
		
	}

}