open up your preset, goto FeralHeart:My Presets: (whichever one you want just not 1 or 2.) lets say preset 7.
go to preset 7, you should see a material file only. now just save your jpeg as preset_7head (or whatever body part it is.)
then open up feral heart, Tools, Preset Maker, the last tab, scroll down and click on preset 7. it should work, if not, you have the name or something wrong. hope it helped
And thanks alot for requesting!