To get a board, click on the "White" or "Black" sign.  The game will begin when someone else chooses to play as the alternate color.  To move a piece, click the piece, and then click the destination square.  The rules follow the standard chess rules.  Moves such as castling and en passant are supported.  If you do not move your piece within 5 minutes of the beginning of your turn, you will forfeit the game.