Look here [http://www.escapistmagazine.com/forums/read/18.198114-Escapist-User-Guide-to-Posting-Commands] for a detailed explanation.
But to sum it up, it's just like using
bold or
italics. You have to use [ and ].
[ img ]*insert direct url of image you're trying to link [ /img] and then take the spaces out
Quote me to see how it's done exactly