On one occasion, I needed to do that, and sent an email to the powers that be.  I told them what was incorrect, and they changed it for me.  There's no mechanism for direct edit, but a second review will replace the first as another option.

the staff first, and ask for them to edit the review.  Wence I was a newbie once, I made the serious error of posting too much detail about a lady's incall (not the actual location, but how her loft was setup - it was a security issue for her, which in my rush to give her a great review, the incall being a super place - I simply got carried away).
Staff corrected the review for me without any questions.