Does anyone know how i can add a friend on msfs forums?
I don’t think that’s possible.
You are correct, it’s not possible to physically add friends on Discourse at the moment (it’s not a feature). The closest thing they have available is a type of follow plugin to follow other users. There is some discussion on their meta site about this already. In the meantime, why not look for some here in #multiplayer:find-a-friend ? You can still connect with others that way.