They didn't, they only gave a general warning to watch out for misinformation[1].
Facebook censored the Hunter Biden laptop story on their own volition. Zuckerberg mentioned FBI in that Rogan interview to muddy the waters and deflect responsibility. He didn't actually say that FBI ordered them to do anything.
[1] - https://www.nbcnews.com/politics/politics-news/fbi-responds-...