How to program keyless entry in an Audi A5?

I recently purchased a pre-owned Audi A5 and it did not come with a keyless entry remote. Can someone provide instructions on how to program one for my specific model?

To program a keyless entry remote in an Audi A5, start by sitting in the driver's seat with all doors closed. Then insert the key into the ignition and turn it to the 'On' position. Next, press and hold the 'Unlock' button on the keyless remote for 5 seconds, then release. Finally, turn the key back to the 'Off' position and test the remote. If it doesn't work, repeat the steps or consult your owner's manual for specific instructions.