The pre-structured image styles tool is great for adding a new look to your promo background image.
To use this:
- In the editor click on Pages.
- Scroll to the Promo page and click on the blue Edit button.
- In the window that appears, open the Background design tab.
- After you have already added an image, you can click through one of the many Pre-structured Image Styles to add different styles to your image.