The published guidance is short: say which account, what you think the mistake was, and anything we should know. Be brief. A reply will say why the decision was made.
A useful appeal has:
- Your username, and the email address on the account. Send it from that address.
- The sanction you are appealing: a warning, a temporary ban or a permanent ban, and the date and reason you were given.
- What you think was wrong, in a few sentences. Name the rule if you can.
- Links to the posts involved, if you have them.
- Anything staff may not have seen. For example, if you were not the one who posted.
Leave out insults and long histories. Staff do not ban over disagreements or a heated argument that stayed within the rules, so if that is your case, say so.
Send it once. The answer comes within 7 days. If a ban stands, the reply says what would need to change.