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The gear oil is the final drive oil - on the back wheel it's the hub assembly that the drive shaft ties into. There's a bolt at the top of it for filling and one at the bottom to drain. You should drive the bike a little to warm the oil, then you can drain the oil through that lower plug. I usually open the filler one on top while draining and I pour some fresh gear oil in to kind of flush it. Then install and tighten the drain plug. Fill with fresh oil right to the top of the filler plug. Some drain plugs are magnetic to pickup metal debris (normal) so clean that off when you have it out.
Clean all oil from the bike exterior. Leave it sitting in an upright position for a period of time. This may require a bike lift or other such device. Then look for leak source. Make sure oil level is not too high. When changing oil it often gets on the cross member and may leak when on the jiffy satnd for a while until it is all gone from this area. Make sure to always use thread sealant and a good o-ring on the drain plug.
Oil drain plug is located near the bottom of the engine, left side toward the front. The oil filter element is located on the right side of the engine under the cover toward the front. Changing the oil filter usually requires removal of the front exhaust pipe. There is an aftermarket filter relocation kit that replaces the filter element with a spin on filter that mounts on the front of the bike.