How to enable parallax background images?

The rock star pro demo includes three parallax images

Parallax background image (showing guitar foot pedals), between two ‘grungey’ black dividers Parallax background image (showing bass guitarist holding down string), between two ‘grungey’ black dividers Parallax background image (zoomed out image showing bass guitarist holding down string), between two ‘grungey’ black dividers

I have installed the demo content but cannot figure out how to configure these parallax images, can anyone give me a steer? Thanks. Claire