Hi
Do you mean changing here is not taking an effect? I have just tested it and its working fine. You mean background color options or background image? Once select the color and save it. Then check it on front end whether it works or not. If you have still an issue then first of all deactivate all the plugins that you have installed in your dashboard one by one. And also did you made any code customization on the theme?
If there is no any code customiztion and backgroud image and color options does not work then Email Us your temporary username and password. Please don’t post your password on this forum too and also provide this forum link on email.
Thank you!