Hi Mike,
I dont have the paperwork but basically you pick one of the targets at the back of the game and move it to the far left. Then you also check which contact pad the target is resting on. Then go around to the gun and look at the target with the sight, then look under then gun and check the stylus is also sitting on the contact pad with the same name as the target in the back. If not, loosen the stylus contact pad and move it around till it lines up on the correct contact pad. Then repeat the process for the other side.
Regards Derek