(note: I can reply to this because I'm an admin, others shouldn't be able to until you make it a not-draft post)

Right now you can only set norms if you have 2000 karma. However, we've been meaning to make it so that you can set norms on _personal_ blogposts if you have around 100 karma or so, but haven't gotten around to it. If it's something you think you'd make active use of, could prioritize it more highly.