Just because the light is on doesn't mean that you performed your oil change wrong. Theres a good chance that the light just needs to be shut off somehow. If I were you the first thing I would do is open up your manual and check there to see if they tell you how to shut the light off.
If not, contact your local Kawasaki dealer and ask them how to shut it off or if they could shut it off for you with the dealer software. Any good dealer should be more than happy to help you. It shouldn't be hard at all.