Unscrew the plug/dipstick, wipe it off, then seat it back in the hole. Don't screw it in. The lube should be at the notch on the stick.
Also, there is lube in the back of the case. The front and rear are separate. It uses a pipe plug only and should be filled to the bottom of the hole.
I would recommend Merc Hi Perf gear lube be used and changed every 25-50hrs. Use some type of suction device to suck the lube out. I always just used a 25cc syringe with a piece of 1/4 inch tubing attached.