I have a UK keyboard so I don't know if this will apply exactly, but when you first load a game, the emulator is set to keyboard mode. If you press the blue diagonal arrow key (above shift and below ctrl on UK keyboard) and the space button at the same time, it will then toggle to joystick mode, which is what you need to play the game.In this way you can toggle between joystick mode, mouse mode and back to keyboard mode, etc.