How to Add Human Skin to a Skeletal Mesh or putting a body on a skeletal mesh

I have a moving Skeletal mesh in the game I am making and accidentally switched my primary skeletal mesh/skeletal animation to a .objx file that didn’t have a skeleton saved, so I messed that up and had to start again. The step by step help videos I found through UE4 Training were very helpful. I have found how to put skin, and have tried to follow the step by step in the Documentation, but I cant figure out the how to do the material. Its confusing for me to describe it since im still a noob to all of these updates. Any help to my actual question title would be nice.