Your reviewer does have the opportunity to edit their review. This is only if they have created a username and password. When they first leave the review they have the opportunity to create a username and password (this is not compulsory to leave a review and is only optional)
Once they log into their user account, they can click their Username and then Reviews.
From this page they will be able to edit, view and delete their reviews.
Alternatively, the reviewer can get in touch with our Support team here to request any changes. This request must to be sent from the same email address that the original review request was sent from. Make sure to include the address of the listing, the agent they are reviewing and their requested changes.