Hiya, to play you'll need to...
1.) Download the game from the website, the installer can be found under the "Official Downloads" link at the top of the page.
2.) Install it
3.) Find the FerallHeart.exe on your Desktop or in Start Menu>All Programs>FeralHeart
4.) Click the exe to run it
5.) Login
6.) Make a character, adjust the settings on each tab to how you'd like them and don't forget to enter a name on the first tab of the creation system! After your happy with it, go to the last tab and press "OK".
7.) You should have a character on your character selection screen now, which is the character you just made; Now select "Start" and you'll be in-game!
Hope this helps, feel free to PM me with any other questions you have!