How do you program garage door opener on a 2008 gmc Denali with homelink?

To program the HomeLink garage door opener in your 2008 GMC Denali, first, ensure your vehicle is parked and the ignition is in the "On" position. Press and hold the two outer HomeLink buttons until the indicator light begins to blink. Then, press and hold the button on your garage door remote while simultaneously pressing the desired HomeLink button until the light flashes rapidly. Finally, test the programmed button to ensure it operates your garage door.