[xwiki-users] [myxwiki] Upgrade

Hi, I may be being particularly dense here, but as a relatively new user of a myxwiki account, I don't understand what tasks I need to perform to get my wiki aligned with the latest upgrade. As a result I am getting a number of pages with embedded text, such as "This configuration cannot be displayed because it was last edited by Admin<http://crindau.myxwiki.org/xwiki/bin/view/XWiki/Admin>who doesn't have permission to edit this page." I don't want to give up on xwiki, as I am really pleased with what I have achieved, even though I only appear to be scratching the surface at the moment. Any and all help gratefully received. Thanks, Jonathan