Well welcome to FeralHeart DjMeow :3 I'll give you a rough estimate on how to get started, play, and what FeralHeart is all about.
So, FeralHeart is an awesome feline and canine roleplaying game or MMORPG (massive multiplayer online role playing game). You can create a character that's either a feline or canine in the character creator which is provided for you when you download the game. You can play as your character and roleplay as it (if you don't know, roleplaying is a way to play AS your character, by typing what your character does). You can chat with other players, roam the different landscapes and scenery or make your own place for your character to live in.
Also, the forum as you can see, is for your own useful purpose. Here other players post their maps, videos, screenshots from in game, asking for help, giving suggestions for the game and much more!
To get started, on the FeralHeart website you'll see the Official Downloads button, click that then it will take you to a screen like this:
You first have to install the 'FeralHeart Game Setup' which gives you the game and I would recommend the Download option rather than Torrent
Then after downloading and installing you download 'FeralHeart Patch' which has the updated version of the game.
After downloading you can log in using your username and password that you registered on this forum and it should get you ingame. You make your character and then start playing
Have fun and I hope you like it like I do