When creating your album, you will be able to add pages (beyond the 24 already included in the base price).
To add pages to your album:
- Go to the bottom of the page, at the last page of your album
- Click on "+ Add 4 pages" (or on "Add pages" if you are on the web)
- You will see a small pop-up with the additional price to pay for the 4-page pack.
- Click on "Add" and add your photos in these pages.
PS: FYI, pages are only added by 4.
PPS: Make sure you don't leave blank pages.