A few people have asked, so here is how names will work when posting opens with V1.0.
You pick a username once. It shows on every post, so choose something you would be happy to see next to a hot take in six months. Letters, numbers and underscores are fine. Names that impersonate real people, studios or staff will be changed.
Flair sits next to your name: fan, creator, investor, press or staff. It is there to give context to a post, not to rank anyone. A fan's opening weekend call counts as much as an analyst's.