How to castle in chess 960

Thanks for the accurate answer, dropping one on the other worked (Castled QueenSide) and was also fun. And I found this thread on my search.

Is there any way this info could pop up from a little link or something in the chess960 game window? This method is special to chess.com and not how it is described in the Wikipedia Chess960 article. I wish I'd known as I moved the king against the rook and it just got left right there with no rook move & no way to undo the move!

I'm having the same issue with this game? https://www.chess.com/daily/game/180660556
Tried putting king on top of rook and rook on top of king, neither seem to be working for me. I'm new to chess 960. Is there something I'm missing?
Check out this game. I am white.
http://www.chess.com/echess/game.html?id=44844126
How do i castle here? I move the white king to c1, or i move the rook to c1 or d1, and still nothing happens. What am i doing wrong?
http://en.wikipedia.org/wiki/Chess960#Rules_for_castling
According the the rules an diagrams in that, i should be able to castle long? Ie castle towards the a side/0-0-0? Can someone tell me what i'm doing wrong and how i can castle?