There was actually a thread similar to this already (which, in all honesty, was made by me when I was an Anon-ass).
Your asking better than I did though.
Check out the Ponychan FAQhttp://www.ponychan.net/chan/?p=faq
Most of the stuff there applies to Uboachan/MostLikelyAnyChan; the mark-up is different though (it's told in Uboachan's FAQ though).
Why thank you, kind sir. (…Ma'am?)
You're right, I suppose it's time I expand the FAQ, or make a guide page.