Could someone PLEASE help me out?

I've installed sdlquake, and everything is fine except one thing. I go into the menu to change the controls but there's no key that takes me back to the main menu so I can't start a game with customized controls...

I've tried all keys, and I've looked in the autoexec.cfg... no joy!!

How do I go back to the main menu after customizing the controls in the options menu?