How do I program my Audi A4's keyless entry?

I recently purchased a used Audi A4 and I'm having trouble programming the keyless entry. Can someone walk me through the steps?

Hi Jennifer, programming the keyless entry for your Audi A4 is a simple process. First, you'll need to locate the radio frequency (RF) receiver in your car, which is usually located in the trunk or on the passenger side of the vehicle. Next, you'll need to press and hold the lock and unlock buttons on the remote simultaneously for about 10 seconds until the vehicle's exterior lights flash. This will indicate that the keyless entry has been successfully programmed. If you're still having trouble, consult your Audi's user manual or contact a certified Audi technician.