Discourse has a lot of settings to govern post formatting, which can be quite prescriptive. We are not yet aware of them all. If you try to post and get a message telling you to change something, please assume this is the website’s default, not an admin choice, and let us know about it so we can decide if we want to keep things that way. We have turned off the rule forbidding allcaps posts, the rule demanding posts have at least 7 unique characters, the rule forbidding emoji in titles, etc. We don’t expect these to be very frequent but there are times it is nice to be silly.
EDIT: The little guidance messages that show up on the right sometimes are also not our invention; if they are annoying we can change or remove them.