What I did was.....
So.. when you downloaded it you got the Mass Markings Pack.zip right?
So then you take that, open it.
And then you should see like cmark.png's and a marking.cfg file.
Ok, then. You need to get your FeralHeart folder!
Mine is located in Start > Computer > C: > FeralHeart
It might be different for you but try to look for it!
Now open it!
Then go to Media > Textures
Once you have that open, go back to the Mass MArkings Pack.zip file.
Highlight EVERYTHING below the markings.cfg file!
Then drag it into the Textures file!
Once you have that, you'll need to do something with the markings.cfg file.
Drag that, into the Main Feral Heart folder. The One where it has folders: "exports" "media" "my_presets" and so on
And if Feral Heart is open, close it and open it again! ENJOYYY!!!!!!!!!!!!