Prologue and Exposition

My 2nd life started as a stupid cliche story. I was isekai'd away to an otome game. Well, at least I wasn't reincarnated as the villainess. I have the best seat in the house; I'm the best friend of the heroine! My job is pretty simple. Pop up to exposit information or teach the heroine the mechanics of the game. Then I get to witness a bunch of hot guys fall in love with my friend and I don't have to worry about banishment or death, so she can pick anyone she wants! Good ending. Bad ending. I'm safe! The perks of being a minor side character!

But what happens when I don't know the information or the mechanics?