There is a simple procedure to do this.
Turn the car on, make sure the odometer is in the regular posistion. Turn the car off. Now press and hold the trip reset button, with your foot off the brake, slowly press the power button twice. The odometer will flash lines then zeros then the light will go out. It may take you a couple tries your first time. If it doesn't work start with the odo on trip a. they changed it at one point and I don't know your year.