How can I reset the keyless entry on my Audi A4?

I recently changed the battery on my key fob for my Audi A4, and now the keyless entry is not working. How can I reset it?

To reset the keyless entry on your Audi A4, you will need to manually reprogram the key fob. First, insert the key into the driver's side door and turn it to the unlock position. Then, press and hold the unlock button on the key fob for 5 seconds, until the car's indicators flash. Finally, turn the key back to the lock position and test the keyless entry.