When playing chess here how can we castle?

here against the computer.

http://www.chess.com/play/computer.html?theme=wood%26amp;size=default%26amp;strength=hard%26amp;color=black



The computer can do it but i can't??When playing chess here how can we castle?
i can castle.... i didnt play the fulll game just tested the castle and i can. just move your pieces from g8 and f8 and then click your king from e8 to g8 and castle is done...When playing chess here how can we castle?
I can't see your position from that link, but the rules of castling are as follows: You can't have previously moved your king or rook, there must be no pieces in between the king and rook, you cannot be in check, and you cannot castle through check. My guess is probably one of those conditions were met preventing you from castling.



Also with computer chess, know that when you castle, you MUST move the king two squares first, not the rook.