Heedbanger

Hi all, Hopefully you can help. I thought I remembered the code for the stereo after changing the battery. Failed twice then thought better get the manual. Found the number but not sure how, but it locked me out completely after 3rd go. Do I have to go back to Audi with tail between my legs, or can it be done easier? Many thanks all who take the time to post. Cheers. A Scottish Audi owner.