This documentation is not using the current rendering mechanism and is probably outdated. The extension maintainer should switch to the new system. Details on how to use the rendering mechanism can be found here.
Please feel free for the technical discussion and to get in touch with the developers and other users. On Slack its own channel was set up for News Comment!
The URL is: https://typo3.slack.com/messages/news_comment/
If you are not yet registered, use http://forger.typo3.org/slack for that!