Just a quick google search says its easy.
"1. Turn ignition from OFF to RUN 8 times within 10 seconds, with the 8th time ending in
RUN. Door locks will cycle to confirm programming mode.
2. Within 20 seconds press any button on first keyless remote. Door locks will cycle
to confirm programming.
3. Within 20 seconds, press any button on second keyless remote. Door locks will
cycle again to confirm programming.
4. Turn ignition to OFF. Locks will again cycle to indicate end of programming mode."