In case your question has not been answered yet...
1. After you've placed all the preset files into the 'my_presets' folder, open the game and go to 'Creative Den' at the login screen.
2. Click on 'Preset Maker'.
3. Go to the last tab and choose the desired preset number.
4. Press export.
5. To share your preset with other users, go to OS > FeralHeart > presets
6. Search for a file along the lines of, 'username_#', the '#' would be the preset number that you just exported.
7. Upload that file to a website (MediaFire is the most popular) and share with others, that way people can see your preset. They need to put the .fhp file into OS > FeralHeart > presets.
If you have any questions, PM me.