Follow the two small oil lines from the oil tank, it will be connected to the oil injection pump, you may have to use a mirror/flash light and hang upside down and/or you may have to remove the air box so you can see the pump. Should have a small lever on top that's connected to a cable, that cable then runs to the carburator throttle. When you move the throttle the pump lever should move. You can search for oil pump adjustment or something along those lines for pics..You may have a leak to so you should check all the oil lines and get a service manual..
When the oil pump is disconnected it goes to wide open/full oil, which can waste a lot of oil.
I filled my oil tank 2 weeks ago, and been using it for skiing/wake boarding, and have filled up the gas tank 4 times(I think) and the light isn't on yet.