First the REVISION feature is only viewable by the author of the release. If logged in and you know your releases URL, go to it, and click on the REVISIONS tab above the headline. Or to view SPW review notes and compare revisions made to your release, log in, click the MY SPW CONTENT tab in your MY MEMBERSHIP Admin area. Then click on the headline/title of your release to open release,  then click “Revisions” tab above the headline of the release (you must be logged in to see tabs above headlines). Revisions allow SPW and you to track differences and comment on changes between multiple versions of your release, and revert back to older versions should there be a need.