Normally, the word list that the user types in is presented to the right of the puzzle. HTML puzzles tend to be a little narrower than they are tall. If you want the words to be at the bottom of the page, select this box.
If the words don't show up anyplace, it's usually because you've selected the checkbox next to each word which says to hide the word from the printed format. Don't do that unless that's your goal. The main page doesn't even have that option any more, but the edit pages do.