Just place the folder in Local Disk (C:)>Feralheart>my_presets and replace the folder.
However, if you have a preset in there like preset_1 and 2, I'd suggest you copy back-ups of these to another part of your computer, or even in the screenshots folder of FH.
Remember to copy the folder. This is what it should be named in the downloaded folder after you open it.
preset_[NUMBER]
Not too hard. c: But about the downloading part, just click download. Let's hope it's a .zip, because I hate explaining .rar's o3o
Then, right click the file and open. Go in and you should see the object you downloaded. c:
Hope this helped.~