From the main menu, choose the Options screen. From there, select Game Status, choose your player with A, then press L-Shift + R-Shift simultaneously. From here, enter the codes. If entered correctly, you'll hear a voice saying ''funky''. Be sure to press the A button after entering each code in order to complete it. When you're done with a code, you will have to press L-Shift + R-Shift in order to enter a new one.