"Daily Chess Puzzles" should be listed as one of the categories. If you do not see it here is the link:
http://www.chess.com/forum/category/daily-puzzles
Then once you click on one of the links for the puzzle you should scroll down below the puzzle and you will see a place where you can post comments about that puzzle.
How does one post a message to Daily Chess Puzzles. When I pick Forum Category, Daily Chess Puzzle is not listed as one of the choices only More Puzzles.
tia