(again taken from them main site)

For the Keyless Entry Transmitter:

Up to 4 transmitters can be programmed.
  • Gather up ALL of the units you want to use.
  • Find a paper clip, open it up and reform it into a U shape.
  • Empty your glove box, deflect the sides in, and drop it all the way down toward the floor.
  • Look at the harness behind the glove box. It runs along the cross brace. Look for a white, two pin, unterminated connector - it may be taped into the harness. This is the programming connector. In the picture below this is the white connector with the yellow incert.
  • Turn the ignition ON so the dash lights come on.
  • Take your paper clip and insert it in to the two pin connector.
  • The horn will chirp to confirm that you are in programming mode.
  • Press any button on Transmitter #1.
  • Horn will chirp to confirm programming.
  • Press any button on Transmitter #2.
  • Horn will chirp to confirm programming.
  • Repeat for Transmitter #3 and #4 if applicable.
  • Remove paper clip from connector.
  • Turn igniton OFF, horn will chirp to confirm exit from programming mode.