If you have already recorded a Find or Attempt on a box and what to add a rating, you can select the circle and enter your information again. You're previous status will be replaced by the new one. The clue owner is able to vote for their own clue, but only once! ;-)
The Most Recommended Clues list is NOT to say which clues or boxes are THE BEST. They are just the ones that have the most positive recommendations for other letterboxers.