Setting the Space bar to play??

New to After FX and my defaults are apprently messed up; the space bar isn't set up to play back my animation (in fact no buttons are, so I have no idea how to play back and all I can do is scrub but then I have no sense of the actual timing)! Went to "keyboard shortcuts" but can't find a "play"function to assign the space bar to. Does anyone know what the play function is called (if not "play") and under which menu I'd find it (ie timeline? edit? animation? view?)? Thank youuuuu!