Jesus christ, do a fawking search.
This fawking question comes up every 3000 or so internet-miles, haha.

Dude, under your dash on the driverside, to the right of the steering column, there's a small black box with a square button.

Turn the car off....... hold the button in, while holding it in turn on the car and hold the button until the light goes off
Walla, gone

It's just a timer to tell you every 3000-5000 miles when you need an oil change -- its supposed to be reset at each one so you know.