Just visit the profile of the business (strip club, escort agency, brothel, SM studio or swinger club) that you wish to rate. You can find the box "review" underneath the profile picture and personal desciption. Click "add entry" here.
You can fill in the information in the form, which you will now see.
Rate the date with 1-5 stars, give a few key details about the meeting and write a short text about it. Once you're ready, click on "add" and your review is online.