Congrats!
To program the HomeLink you'll need to use the remote that comes with the garage opener.
Basically you push and hold down garage remote button, at the same time bush and hold the desired HomeLink button until the led flashes rapidly. When I programmed mine, I placed the garage remote close to the HomeLink buttons.
After that is done you'll need to push the learn button on the side of the garage opener and immediately push on the HomeLink button so that your HomeLink is synced with the garage opener.
Here's an easy video. If you have the rolling code like mine, make sure you watch the video all the way through. Especially from 3:10.
[video=youtube;0BseDur3LG0]https://www.youtube.com/watch?v=0BseDur3LG0[/video]