To locate royalty-free stock images when on the Photos page of a project:

1. Click on the Add Photos button near the right side of the page:
   
   
   
   
2. Click on the Stock Photos icon:
   
   
   
   
3. Find the Show menu and select a category (e.g. "Architecture").
   
   
   
   
4. Click on the new option to the right and select a category (e.g. "Home Interior").
   
   
   
   

Images of home interiors load below the menus. Click on the thumbnail images, or the zoom icon below one, to preview a larger version. Click the checkbox for an image to select it.  If selecting multiple images, images will be loaded to the project in the order you select them.  When you select your image(s), click the Add Selected to add the image(s) to the project: