If you wish to use a single non randomized background image for your SSRPM site, follow the steps below:
Before you begin, make a backup of your entire SSRPM web directory, you may have to stop the site in IIS to do this. (C:\inetpub\SSRPM\SSRPM_FA)
1. Create the image file you want to use, the default resolution for the background images is 4704 x 3136.
2. Name the file, "Background01.jpg" and place it in the images directory (C:\inetpub\SSRPM\SSRPM_FA\Content\Images).
3. Open the Web.config file and set "EnableRandomHomeBackground" to 'False'. This should be on or about line 229.
4. Restart the IIS service to make sure it pulls fresh files and reads the new setting.
Go to the SSRPM website and see if your new image is in place. You may need to do a "hard refresh" to get any cached images cleared (CTRL F5 in Chrome).