How to change your background images 

Note: it will be much easier if you have your website open in two separate windows or tabs for this.

1. In your first window or tab, upload an image to this page 
2. View the page (you will come back here shortly)
3. In your second tab, go to the page where you want to add a new background
4. Click on Settings in the top right
5. Click on Advanced
6. Copy and paste the code below and don't save anything just yet:
   <style>#outerWrapper {background-image: url("PUT YOUR IMAGE LINK HERE") !important;}</style> 
7. Go back to the first tab
8. Right click on the relevant image
9. Select "Copy image URL" or "Copy image link"
10. Go back to the second tab and where it says "PUT YOUR IMAGE LINK HERE" paste the image link, keeping the quotation marks