Part of the Guidelines for Creating Crosswords state
...Since creating a good crossword is no easy task, we have opened up crossword creation at this time only to authors who have a track record of submitting good quizzes on FunTrivia. We realize that some of you other folks may be GREAT authors, but in order to make editing easier for us and the experience less frustrating for less-skilled authors, we do strictly limit who can create crossword puzzles...
So I guess the answer is, get in there and make some great quizzes.
(The great quizzes are those with the sunglasses.)
Twenty quizzes online was another minimum requirement, but like you I am having difficulty finding it.