Head to Bookshelf and click on the month you'd like to add your collage to
Click and hold on the first picture you would like to add to the collage
Click on the second picture, and you will see a button light up at the bottom of the screen. Tap on Collage
Your page will populate with a two-picture collage
If you'd like to learn how to make a collage by adding more than one photo per page on the Chatbooks app, please click here.