You carefully have to look at the name of your preset. If it says, for example, 'preset_
4body/head/tail', you have to put it in C:FeralHeart > my_presets > preset_
4. The folder you put your preset in depends on the number that is in its name.
After you put it in the right folder, open your game, and click Tools > Preset Maker. Then you should see a list of Presets. Just click on the right number (if your preset is in the 'preset_4' folder, click 'Preset 4') and you should see it on your character.
When you did that, click 'export'. Then simply log in, make a new character/edit a character and go to 'IV' (the step were you usually color your character). Then click 'Use preset' and select the preset your character should wear.
Hope that helps