I have lost my owners manual and need to reprogram my homelink garage door opener on my 2003 H2. Can someone help?

 

if i remember right because i just did this like a month ago....u basically just hold up your existing car door opener within inches from your homelink button in your hummer and you hold them both down at the same time until you get 3 quick blinks from your homelink light then let go of both and it should be good to go....