Choose SuperT Player type. Then, put your cursor over the following players, and wait for one second at each: Ryu, T. Hawk, Guile, Cammy, Ryu. Then push BACK (the button next to start) and immediately afterwards push all three punches.
Highlight a character and press Start. This changes their color to the Super Street Fighter 2 Turbo color if the second player selects the same character in Super mode.