By set the background image in “General Settings” dialog, it will be shown for all the scoreboard screens.
To specify different background images for each screen, you will need to edit the scoreboard template by the “Layout Editor”
Click “Layout” button on “Terminal” program.
Select the screen that you will like to change the background image.
Click the “Open” button beside the “Background Image” label.
Once the background image be loaded, save the template, and reopen the match from the “Terminal” program.