It's funny how a lot of us never do this but when we do the shock of it only needing a few ounces of oil is funny.
There is a drain bolt on the bottom. Open that up and drain with the bike on the centerstand. Open the inspection cap. I spin the wheel a few times. Then put the drain plug back in and fill at the inspection hole till it becomes level. Place the cap back on and wipe up any oil that may have spilled. Ride the bike for a while and then do it again. Probably good for many years.