If you accidentally select the wrong review recommendation (negative instead of positive, or vice versa) or submit the review before you had entirely finished writing, simply contact the Envato Studio team to help you out.
When contacting us, please be clear about the job ID, the issue, and what outcome you would like to see. If the review simply needs a copy update, please include this new copy. If the review just needs to have the recommendation changed, please tell us this also.
You can contact the Envato Studio team here: https://studio.envato.com/contact