Can someone explain how to castle in 960 or is there someplace that explains it?
Google? Wikipedia? Did you even try?
http://en.wikipedia.org/wiki/Chess960#Rules_for_castling
Perhaps he means how to castle while playing Chess960 on Chess.com? In which case the answer is move the king onto the rook you want to castle with.
Can someone explain how to castle in 960 or is there someplace that explains it?