How to changes the player characters material in runtime?

I’m trying to changes the material on the third person player character by pressing a key on my keyboard. the material I try to replace only shows the chess tersutre, and won’t compile when the game is running.
Is it any way to changes the material?
I don’t meant to changes the color, but the texture.

324680-0010.png

I was able to find the solution, the only thing that I needed to do was to go under the “Usage” and select the “Used with Skeletal Mesh” check box

324669-0012.png

Hi, Im with the same problem. Where I find this option : “Usage > Used with Skeletal mesh” ??
Thanks