1)zip-tie the cam chain so it's easier to fish out of the case.
2)If you have the engine in the frame and want to take the cylinder off you will have to take the studs off so, thred a nut on the stud then thred another one on top of that and tighten them together. Then turn the bottom nut counter-clockwise. That will pull the stud out.
3)To take out the tensioner you have to un-hook the spring off the cylinder and loosen the tension adjuster nut#14,6(in the link) then pull the whole thing out from the bottom of the cylinder.
A good description of the chain tensioner is here