How do you change your name

Im not new to Gmod I played it B4 on my buddies house so i bought the game i cant find the change name button please help me.

Change your Steam name. Right click on the Steam icon and go to Friends, then on the arrow pointing down next to your name and select “Change Profile Name”. Changing that will change your ingame name.

Or you can just use the console command Name “namehere”
It only works once I believe but do correct me.