How do you program a remote keyless entry fob for a 2007 Buick Terraza?

To program a remote keyless entry fob for a 2007 Buick Terraza, insert the key into the ignition and turn it to the "On" position without starting the engine. Press and hold the "Unlock" button on the driver’s door, then press the "Lock" button on the key fob three times within five seconds while still holding the "Unlock" button. Release the "Unlock" button, and the locks should cycle, indicating successful programming. Repeat the process for any additional fobs.