In addition to the buttons you’ll see at the top of the posting window:
there are more options available for formatting.
“Common Markdown” is implemented:
A subset of BBCode is also available:
[b]strong[/b] [i]emphasis[/i] [u]underlined[/u] [s]strikethrough[/s] !(upload://cwzd1fDM4DLajulJGNabFgWcBRp.jpg) [url]http://example.com[/url] [email]email@example.com[/email] [code]\nx++\n[/code] [spoiler]spoiler[/spoiler]
Some common HTML is also enabled if you want to try your hand at that.