Quick question on fixing a biped rig

I recently found one of my old unused 3dsmax biped rigs that I created by following this tutorial:

Now the rig looks fine, but I realized that I screwed up the angle of one of the hands since the fingers get all bent out of shape when I move around the arm. Now I want to adjust the biped hand slightly, but the problem is since they are linked to the skeleton&mesh, they move with it. I tried removing the Position & Orientation constraints I set on the bone, but that really messes everything up as the bones on the mesh move in really awkward positions. I think I even tried with figure mode on/off but it would either not move or have the same problem. Any suggestions?