Congrats.
For leaf shutter use, set the camera body's shutter speed to 1/8 sec. Rotate the front ring to the shutter speed of your choice, activate the leaf shutter by rotating the arming ring and attach a flash to the lens then shoot. Do not use mirror lockup.
Unlike the 90mm LS, you can't do double exposures or vibration-free pure leaf shutter shots. After every shot in the leaf shutter mode you must re-arm it again.
For normal lens operation, turn the front ring until the circles or "dots" align, cock the shutter open and shoot away at any speed on the camera body dial. When ready to stow the lens at the end of a day's shooting, release and close the leaf shutter to keep the tension off the springs. You can do that with the lens off by pushing down on the lever sticking out the back of the lens with the lens set to a LS mode.
You can practice this all without film on a 6x7 and 67 but I don't have a 67II but I suspect you can do it on that too.
You can download a poor copy form
this stupid site. I have the paper manual. I should do a good scan of it