OnlineSubsystemFacebook - how to use it?

Hi, I’m new to unreal. I want to try the OnlineSubsystemFacebook plugin. I enabled it in the plugins window. Yet I cannot seem to find anything about facebook when I try to look in the blueprint nodes… Can someone shed some light about how should I use it? I search the internet and I couldnt find any useful piece of information. Unreal documentation of the subject is very poor also unfortunately. Any help is appreciated.