2002 range rover garage remote programming

I have a 2002 range rover and I have no owners manual.  I would like to program my garage door opener with the opener in my truck. I tried using the land rover programming but this did not work.  Could someone please tell me the steps to program my truck with my garage door.  I have a Genie garage door opener.  Thank you!

http://www.homelink.com/training/train.taf

THANK YOU VERY MUCH!