If you provided a comment on a puzzle upon completing the puzzle, as far as I know, the only way to see that comment again is to get lucky when the server serves up a new puzzle to you. I.e. I don't know of any way to retrieve a specific puzzle from the library to see the comment.
The best way to get clarification about a hint or get help on a puzzle is to take a screen shot of the puzzle, start a forum thread to ask the question, and attach the screen shot image to the forum post. Make sure the screen shot has the puzzle grid, clues, and hint text.
You will probably get an answer within 24 hours.
Hope that helps!