If you can't figure it out, then we're the ones who are dense, as we obviously haven't explained it properly. You can just go to our main Ann's Club page at:
http://www.annthegran.com/AnnsClub.aspx
Go to the bottom of the page and click on the "Buy Now" button that corresponds to how long you want to extend for.
Hope this helps.
BB
For information on how to use all the great features on AnnTheGran.com to help you create better projects, please visit my Magic Bookshelf blog.