Oil for the engine goes in the oil tank. Oil for the transmission/gearbox goes in via the round inspection port on the right side above the kickstart lever. The gearbox oil level plug is just behind the kickstart lever. It should be removed and oil added until it starts to drip out of the level plug hole. The primary transmission is the large case on the left side that houses the drive chain that connects the engine output gear to the transmission. It gets filled through a large inspection hole near the top of the case and also has an oil level plug low on the case below the foot peg, not to be confused with the center fixing bolt which is pretty much in the center.
And then there is oil in the front forks, so that is four. And then there is the swingarm pivot, which is number five, but I'm not going into that here!