I assume that you mean when you try to diengage the clutch it doesn't.  This may be siezed clutch plates or the hydraulics not working.  I#'d check the latter first.
If it is the clutch, take out the gearbox and you will find the clutch bolted to the flywheel.  Midget gearboxes aren't very heavy.
I suggets you get a Haynes manual.
                
 Terry
                
 April 2006