how to castling in chess?

how to castling in chess?

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.) In order to castle, however, it must meet the following conditions:

• 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

I'll assume that his question was meant : how to castle on the computer or on the site.  If that's the question than you have to move your king first and the rook will automatically move.  If you move your rook first...it will not work.