Instructions to reset are in the owners manual, I believe.
If not, there's a button in the electrical centre on the ls of the dash. Pull the cover, turn the key on, press the button once and release it (RED button marked RESET). The light will start to blink. Press and hold the button again until it beeps three times over the audio system.
OR the gas pedal trick. Turn the key on, and push the accelerator all the way to the floor and release it three times.