Facebook is one of the worlds leading social networks allowing users to create and share content. The Facebook app Bloc allows users to leave comments directly through your Cindr site. When a user leaves a comment it is published directly on their Facebook wall. There's nothing else you need to do, just add the Bloc.
To add a Facebook Bloc go to the site editor and from the side menu select 'Add Blocks' > 'Apps', scroll down until you see the Facebook logo and click any of the available Blocs
Remember to save/publish your site to reflect any changes you make.