Thanks for using our theme.
Please provide temporary wp-admin access, so we can take a closer look at your settings.
Create an account via Dashboard (Users > Add new) with administrator role http://prntscr.com/s3rc9m > provide us with username and password via the Private Content area http://prntscr.com/s5mao7 You can use any email for it.
“Whenever I try to set a background image or colour on my website it displays on the backend as it should look.” – provide screenshots of your settings.
You can use Lightshot screenshot or Gyazo tool to make screenshot and share the link here.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.