The instructions are at best incomplete and at worst incorrect. They call for adding a link within the comment php file and make reference to where it should be placed. The suggested code in the file does not exist. I have attempted to place the plugin code in many, many places without success. Further, the plugin setting page is not installed correctly or accessible in 2.8.5. It may have worked in an earlier version, but it is currently dead.
The plug-in page on WordPress is over one-year old and the author plugin website is equally dated, offering only pay-me for help.
Unless the plugin author maintains their plugin, they or WordPress.org should remove it.