how to castle?

how do i castle in this game?

Castling

One other special rule is called castling. This move allows you to do two important things all in one move: get your king to safety (hopefully), and get your rook out of the corner and into the game. On a player’s turn he may move his king two squares over to one side and then move the rook from that side’s corner to right next to the king on the opposite side. (See the example below.) However, in order to castle, the following conditions must be met:

• it must be that king’s very first move
• it must be that rook’s very first move
• there cannot be any pieces between the king and rook to move
• the king may not be in check or pass through check

1. O-OO-O-O

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Notice that when you castle one direction the king is closer to the side of the board. That is called castling kingside. Castling to the other side, through where the queen sat, is called castling queenside. Regardless of which side, the king always moves only two squares when castling.

The diagram unfortunately isn't functional, but if you click on the |<  symbol it takes you to the article where it does work.

If you mean "how do I castle when I'm playing a game on here", just move the King two squares and the program auto-completes the move for you.