To rearrange your photos in your Monthbook/Mini follow these instructions:
Log into your account at chatbooks.com and click into your bookshelf
Click on the subscription you'd like to edit
Click on the Chatbook you'd like to rearrange the photos in
Click on "Rearrange pages"
Click on the photos you'd like to move, a black box will appear around them showing they've been selected
Click and hold on one of the selected images and move the photos throughout your you'd like them in your book
Once your photos are arranged how you'd like them in your Chatbook, click "Exit Rearrange"
You can also rearrange your photos for your Monthbooks/Minis on the Chatbooks app. Learn how to do this here.