You have a choice for how to create custom pages. If you want to select photos, memories, and signatures and have the pages automatically created, you can use the auto build process. If you want to create the custom pages from scratch, you can use advanced editing.
To auto build or manually create custom pages, in Kid Yearbooks, select Build Custom Pages.
When using the auto build process, Step 1 is selecting photos from your photo sources to add to the selection tray. After you add photos to the tray, Step 2 is adding Memories. Step 3 is adding Signatures. You will then Build Pages which means that all of your photos, memories, and signatures will automatically be added to custom pages. These pages will be editable if you want to make changes to the pages.
Using advanced editing means that you will manually add photos, memories, and other content to the pages. Select Try the Page Editor to skip the auto build steps.
Here is a Step by Step article for creating custom pages: