Well once you have downloaded the particles, place the material, texture and particle file into LocalDisk (C:)\FeralHeart\Media\Particles then Open up FeralHeart. Once FeralHeart is opened go into Object maker and then you should see a button that says 'effect maker', like this:
(http://i41BannedImageSite/24nisgn.jpg)
Once you've entered Effect Maker, you need to type in the PARTICLE file into 'Particle Template'. As you can see, I typed in 'Swarm' because that is the Particle name of the particle file I downloaded. Then click 'Add New' to add the particle into the effect maker.
(http://i39BannedImageSite/rb0g9k.jpg)
After that, go to 'Billboard' and click Object maker. But don't worry, your particle will still be there!
(http://i39BannedImageSite/53s96p.png)
Once you're back in Object Maker, name your particle and place it into IT'S OWN group then export it and re launch FeralHeart and test it in your map! :3
(http://i41BannedImageSite/2eydlhh.png)
Good luck, I hope it works! If you stil have trouble then just come back :3...