Oooh, I know how to help you out there. And if you're downloading presets for your character you have to follow a different set of steps :3
1. When you download the winRAR files, you have to extract them. There should be a button that lets you do this, but you can also right click.
2. Once you extract the files, there should be a folder with the name of the preset showing up with "copy" beside it. Double click this.
3. Inside the file there should be two things: high light and copy the file that's on top, ignore the bottom.
4. Once you've done that, follow these steps:
-Computer
-HP (C:)
-FeralHeart
-my presets
-Choose any of the numbered folders but one and two. I suggest using one of the higher numbers like five and up.
-Right click and paste once you double click the chosen folder
5. You'll be asked to replace or copy the material that's already in the folder. Go ahead and replace.
You should know what to do from there, but just in case here are the rest of the steps!
6. Go to FeralHeart and enter your user, then go to Tools, Preset Maker.
7. Select the canine or feline option (this isn't really necessary, but depending on what the preset is for I would select one of these options first, like if the preset is meant for a canine I'd click canine. You never know xD)
8. Go all the way to V, and you should see a mini box with "presets" and numbers beside them. Go to the one numbered with the file you used to save your preset in.
9. Once you have it selected, you should see the preset on the character. If you do, simply click "export". It'll show you how the file is saved, which will be your username_the number you used to save the preset you saved in.
10. After that's done, find the file with that name. It could already be in your preset folder (it's been awhile since I've done this xD), but just in case it isn't follow the steps I've already provided.
11. Once all of that is taken cared of, go to FH, log in, and select the character you want to put the preset on. Go to V again, and click the "Use Preset" button. The file should be visible, simply click it, then OK, and you're done!