new clutch in fiat punto?

hi, the punto auto saga continues (wont engage reverse gear)i have obtained a secondhand auto gearbox today (punto 60 selecta mk 1), dont even know if it works, but for the pittance i paid for it.its worth the risk!.
does anyone know exactly how they work and what should i check for before fitment, how is the clutch removed? there seems to be a strange cover\plate in the gearbox that doesnt appear to be bolted on yet am unable to remove, any ideas greatly appreciated