Lift the vehicle up, facing the direction of the rear, there is a hex socket bolt in the middle of the right side of the gearbox and in the lower part. After opening the bolt, the upper part is the refueling port, and the lower part is the oil drain port. First, remove the oil drain bolt and drain the oil. After the old oil does not flow, remove the oil drain bolt and blow it into the refueling port with compressed air to blow out as much old oil as possible and install the oil drain bolt. Use the pressure oiler to add the new oil from the oil filler port, add one until the new oil flows out of the oil filler port, tighten the oil port bolt, and wipe the remaining oil stains on the transmission surface with a clean soft cloth.
I hope I can help you. Have a nice day.