I got to within 3 days before I panicked!
It's not very informative, is it? I even used their email helpdesk and didn't get an appropriate answer. So, out of desperation, I posted a thread in the Strategies section of the forum and got an answer in 10 minutes. If I find that thread, I'll update with a link. [Edit -
http://www.disboards.com/showthread.php?t=2489142&highlight=photopass]
If you haven't worked it out, here's what I did in May for PHOTOPASS PHOTOS only. I didn't order the book.
1. Add all the photopass cards to your account. (I'll assume that you have already done these)
2. Go to Enhance>Disney's Photopass Photos and add your borders, special effects etc. I was saving each photo as a new file instead of overwriting the original. (I think that if you know what print size you are going to print your photos in, this is the time to select it so that it is sized appropriately and save as separate files).
3. (As I don't have any photos left, I can't go in and check this step) When you're done, go to View All and Order. Select Photopass CD from the selection. You don't have to individually select any or all of the photos. Just order the CD.
4. At the checkout/cart, you will still need to pay about $18 (?? It's either $8 or $18) for international shipping. Your prepayment will be noted at this point and you should see a charge for the CD and the prepayment credit for the CD as a separate line item. (And there will be a line for the International Shipping as well)
My CD arrived within 7 days of my placing my order.
If you have prepaid for your photobook, I would assume that the same View All and Order step would work?
Hope this helps.