Adding a border to a photo in your book is simple, just follow these steps:
- Click on the photo you want to add a border to in order to select it. You'll know its selected when icons appear around the photo.
- On the toolbar above the workspace you'll see an Icon titled "Border". Click on that icon and it will reveal a slider. Drag the slider to the pixel-width you want for your border (or simply enter the number of pixels into the input box to the right of the slider. If you want the color to be other than white (the default) just click on the white box at the right end of the border panel - this will open the color selection tool.