You can drag and drop any photo onto the background area of the page to use it as the background. From the popup menu that appears, select the Apply as Page Background option.
If you haven't already imported the image you want to use as a background, click the Add Photos button above the Media Tray, select the image/s you want to import, and click "Upload". Then you can drag and drop the image into the background area of your page.
Tip: Because some cropping can happen during book production, we recommend keeping important image details (such as people's heads) at least 1/4" from the edge of your pages or inside the dashed lines on the pages or covers. See our Safety Zone Warning page. Be sure you have the size and type of book selected that you plan on ordering.