Change the player's name to one of the cheat codes and press ENTER. After entering all the cheat codes, press back to undo the changes so that player's real name is not changed. Now go back to the main menu and press Scroll lock to activate the cheat menu.

Cheat Codes: 
Zico = Enable 1982 Classic Match 
Hurst = Enable '82,'74,'70,'66 Classic Match 
Kenny = Flaming Ball 
Gabo = Big heads 
Kyle = Skeleton players 
Cartman = Take a dive 
Gonzo = Hot potato 
Mr Hat = Crazy Ball 
Powder = Silly Moves
Neila = Alien Mode