How can I reset the immobilizer on my Audi 80?

I recently replaced the battery on my Audi 80 and now the car won't start. I have been told it could be because the immobilizer needs to be reset. How can I do this on my own without going to the dealership?

To reset the immobilizer on your Audi 80, start by locking and unlocking the car with the key fob five times in a row. Then, insert the key into the ignition and turn it to the 'on' position without starting the car. Keep the key in this position for 10 minutes, then turn it back to the 'off' position and remove it. This should reset the immobilizer and allow the car to start again.