mantaray

Hello, Sorry to ask but I am really stumped after purchasing GameEX, I am finding it hard to figure out how to set an exit button. Everything else is set-up nicely, including harder things than this I imagine!! So for the emulator Fusion (genesis) I have 2 USB (via IPAC) joysticks attached in an arcade cabinet. How do I make button 8 on the 2nd joystick the exit button for this emulator only? If joystick2 is a problem , even joystick one button 8 will do? I have cruised the forum and usually I am ok with problems but failed to understand so before I go scripting and looking to external programs, I was wondering what is the basic understood way of doing it with gameex? Many thanks indeed.