Struggling making a Costume Mod

[pure dew]

Hey y'all, I've been trying to make a costume for FeMC with the Costume Framework Mod, however I've reached several roadblocks, due to my lack of knowledge and experience with modding. I've been reading through a variety of other posts here, and am still struggling figuring out how to properly get it situated.
I tried using the riruin's fork of P3R-Project as a base, but I don't seem to understand how to use Materials and material instances. (Also, when using riruin's fork, it does not natively have an option to plugin the shc file? I'm not sure why, so I plug the shadowcolortex into the normal but i doubt that's a good idea.)

[pure dew]

I don't understand why there just, isn't an option for me to use or enable a shadow color?

[timber elbow]

The reason there isn't a shadow color texture parameter is because there isn't one set up in the master material.

I want you to go to the file Content/Xrd777/Characters/Common/MasterMaterials/MM_CH_Base_OpMk and open that up.

What you need to do then is just copy an existing image node and rename it to ShadowColorTex and connect it to the material on the right, the logic for where it connects does not matter, just that is is connected.

Once it is connected, any material that was instanced off of MM_CH_Base_OpMk will have the ShadowColorTex image parameter available.

This is a different MM but the concept still applies, you can see I just have it connected to a random node on the material. Any textures connected won't show up properly in Unreal Engine but the game will read them just fine.