If you have added a background image that you do not like or accidentally uploaded then here are the steps to removing it.
1. Log into your dashboard.
2. Click the locations tab on the left-hand side.
3. Choose the desired location
4. Scroll to the bottom of the page and you will see the background image window.
5. Click the "x" in the upper right-hand corner of the image that is directly to the right of the background image window.
Now you can add/remove an image as much as you like until you have the desired image. :)