This page is used to control what smileys are supported by the wiki. Just write the text of a smiley to display it.
To change the supported smileys, just edit the lists on this page. Note that the format is important; each list item should start with the text that is turned into the smiley, escaped so that users can see what produces it, followed by a WikiLink to the image to display.
Bear in mind that the link to the image needs to be written in a way that will work if it's copied to other pages on the wiki. So be sure to include the smileys directory in the path to the file.