How to edit background wallpaper on second screen

I'm sorry for my bad English in advance but I am confused as to how to go about changing my background wallpaper on my non main home screen. Currently it is an ugly pixelated image , pic related. When I go into the background tab it only allows me to change the background for my main screen. Any advice would be much appreciated.

Background in Kustom is not "screen" based, if you want an image to appear only on Screen 2 then you need to add an Animation of type Scroll to it so it will show on Screen 2 only. If the preset you are using already has this just find that image and change it inside the preset, usually it should be in the "globals" tab if its not then you need to find it in the object list somhow.