Adding Ghost purchased at a retail store to my Norton account?

As said in the subject, I'm wondering if there's any way to add the product information from a Norton Ghost that I purchased at a retail store to my Norton account on the website (mainly so I don't have to worry about losing a little slip of paper with the registration number on it). I looking around and wasn't seeing anything, so it might not be possible, but it's also quite possible I just missed something obvious. Thanks.