here is what you need to do open your mugen.cfg file (found in the data folder) and scroll down to the bottom untill you see this: [input] P1.UseKeyboard = 0 P2.UseKeyboard = 1 ;Joystick type: ;0 - Disable ;1 - Autodetect (not reliable under DOS) ;4 - 4 button ;6 - 6 button ;8 - 8 button ;20 - Sidewinder ;21 - SNESKey ;22 - PSX pad ;23 - N64 pad P1.Joystick.type = 1 P2.Joystick.type = 0 asuming that you want to set the keys for player 1 you need to change the options to what I have here next open winmugen and choose options--> input config --> joypad config hope that helps