Parallax scrolling for 2D Endless Runner

Hello guys,

I would like to make a background with several layers that move at different speeds in my 2D game exactly as in this video. [UE4 Tutorial] 2D Parallax Scrolling using Materials - YouTube

I try to follow the tutorial linked in the video but I don’t understand how to the background could move… I have some trouble with the parameter of the material to get a layer with alpha texture too .

Hope you can help me, thanks