If I may, I would like to point out that these 'marshmallows' you are seeing are not really marshmallow individuals. They are wearing Mass Markings so, to them, they have downloaded extra markings to wear. They see themselves wearing the extra markings. Though, to those who have not downloaded Mass Markings, those individuals see them as marshmallows. Just wanting to throw that out there for ye'.
Also, if you do what Coding suggested, you'll have to 'Export' the preset. Which, you can do in the Preset Maker. Once you've exported it, you'll have to upload the file (that file being YourUsername.fhp which is located in your FeralHeart>Presets folder) to Mediafire in order for others to download that file. Unless they download it, they won't be able to see your marshmallow preset.
Nope. They won't be able to see your preset until they download the preset file you're wearing.