there's a little chessboard icon in your text box to post games, just follow the instructions.
fen is for positions, pgn for whole games.
to download pgns, go to any game of yours and look for the 'Get PGN' link. alternatively, get the game's id and insert it here in place of the X's:
http://www.chess.com/echess/download_pgn.html?lid=XXXXXXXXX
Hi everyoe. How exactly can I post a game for others to play through? Is it with the fen string or pgn?