Pick a topic. Each one walks you through it in a few steps, with pictures.
If something is missing, tapping «Post» tells you what in red (for example, no topic chosen, or the text is too short). Fix that and try again.
Usually within a few seconds. If the post might break a rule, or the community has admins approve posts, it can wait until an admin has looked at it.
No. With «Post anonymously» on, other users can't find out who you are.
It didn't follow the platform's or the community's rules. The reason is usually sent to you. If it wasn't, contact the admins (Settings → «Contact Us»).
Someone reported you and the admins gave you a warning. Breaking the rules repeatedly can get you banned from the platform.
On the «Activity» page, tap ⚙ and turn off the kinds you don't want. To stop notifications from one post, tap the 🔔 under it.