In order to make presets, you pretty much just look into your FeralHeart folder, then click 'My Presets', and scroll down to reference.
Just edit anything in there, save it as let's say 'preset_5body', then open up your game and wall-ah, you have a bootiful preset!
You can also just edit around with preset_2 or preset_1 with GIMP, Paint tool SAI (I use this, though I doubt anyone else does), and Photoshop.
Also, if your preset shows up all white, try changing the file from 'jpg' to 'png', or the other way round'.