You may see the time that a wiki page was last modified by using the ''!-!lastmodified-!'' widget. It should be placed at the beggining of a line in the wiki text. !-!lastmodified-! The result of this widget is this: !lastmodified
Use alt+s (Windows) or control+s (Mac OS X) to save your changes. Or, tab from the text area to the "Save" button!
Grab the lower-right corner of the text area to increase its size (works with some browsers).