Withdraw a review
Paste the code you were shown when you published. It comes off the page immediately and stops counting towards anything.
If you have lost the code
We cannot give it back to you, and that is deliberate rather than unhelpful. There are no accounts here and no address is stored, so the code is the only thing that distinguishes you from someone else asking us to delete your review. If we kept a way to reconstruct it, so would anyone who reached the database.
If a review breaks the law or names a private person, that is a different matter and does not need a code — it needs an editor, and we take those down on their merits.