This documentation is not using the current rendering mechanism and is probably outdated.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.
To integrate the news comment extension in your system,you need to follows these steps.
Install the News System extension and integreate to your system. Prepare news detail page with necessory settings.
Select detail page of news. Click on the New Button to add a new content element to this page and choose News Comment. Place news comment extension just after news extension.Set the storage page id of News Comment system folder for the record storage.