Is it possible to change from the black screen on main output when displaying lyrics on stage display?  Would like to set a specific image to use when singers are performing instead of black screen.

That is not an option at this time. It is a Feature that has been requested though, but the developers have not stated whether it will be implemented in a future update or version.

Prbcav7, I need to apologize. I misread your question and gave the incorrect answer. Yes, you can put a background on the main (Front of House) displays and EW will continue to use a solid black background on the Stage (Foldback) display. There are numerous ways of accomplishing this. You can drag an image or video file rom the resource area and drop it over the song in a schecule tends to be the easiest and quickest way of doint this.