The sub-pages beneath this menu item contain instructions for using the FNF plugin in its three configurations:
Surface: sense-making based on what can be seen on a given web article page.
Thoughtful: reputation-gathering based on about-us pages and publication and author reputations and history.
Detailed: tracking claim=>evidence=>reasoning to weigh whether the arguments are made in good faith.
Below are videos about each of the configurations, which can be changed via the Actions tab on the plugin.