metaphoar

I downloaded the Spawn skin for CJ in the downloads section but I am not sure what I am supposed to do in order to get the mod to work. I use IMGTool to open the files up and replace the ones it tells me to but after that when I go into the game I'm not sure what to do in order to turn CJ into the full Spawn. Could someone give me a step-by-step tutorial please? Thanks!