It only takes a second or two.
Select the type of book you created with iPhoto or Aperture. Double check your PDF by opening it on your computer before uploading it.
By default, our books do not include a dust jacket.
With the release of Apple Photos, Apple no longer exports spine text in their PDFs.
Click the PRINT BUTTON and click SAVE AS PDF. Also, the following are very important:
(This will remove the page and shift the rest of the pages)
(This can be a just the front cover, or a full wrap image)
(You can choose a solid color for your back cover in Step 2)