Note: After saving, you have to bypass your browser's cache to see the changes. Internet Explorer: press Ctrl-F5, Mozilla: hold down Shift while clicking Reload (or press Ctrl-Shift-R), Opera/Konqueror: press F5, Safari: hold down Shift + Alt while clicking Reload, Chrome: hold down Shift while clicking Reload.
$['when'](mw['loader']['using'](['mediawiki.util']),$['ready'])['done'](function(){mw['util']['addPortletLink']('p-personal',mw['util']['getUrl']('Special:PrefixIndex/User:')+mw['config']['get']('wgUserName')+'/','Subpages','pt-mysubpages','Show your subpages',null,'#pt-preferences')})