Unable to add Textures/Shaders
 

Hey guys.:D I am having trouble applying a different shader onto the geometry of a rig. It should be a straight forward thing, yet when I try to apply it, nothing happens.

Could it be the texture is somehow baked onto the rig? Here is the default HyperShade.
https://imgur.com/gallery/bfhxRgG

Any ideas on how I can apply a new shader onto the rig?