Okay, let's start all over again.
Download the Legendary Markings v4.1 pack.
Once you open it, another folder should pop up called "media". Open that up, click textures, and then markings.
Copy ALL components in the markings folder by pressing Ctrl + A. The markings.cfg file is also included.
Paste the markings (and the markings.cfg file) into FeralHeart > media > textures > markings. If you receive a popup stating "The destination already has a file named...", press replace.
Go back to your Legendary Markings v4.1 pack and copy the markings.cfg file from the markings folder and paste it into your main FeralHeart folder. Replace again if it asks.
After following these steps thoroughly, restart FH by closing any FeralHeart.exe applications that are running and starting it back up again. Go to your character edit screen and see if they work.