Hello guys this is a simple tutorial on how to apply the custom background for the mcsm pack all you gotta do is copy the png file that is in this folder called for simple menu mod and then what u wanna do after u copied the png you go to the minecraft folder then u find the folder called config and then from there you wanna find simplemenu folder you open that then you go to the background folder and then u paste in the copied png and thats it enjoy.