3
That link is found in cp_functions.php in the include folder, line #114, at the end of the line you can see the link details, you can edit it or put your own RSS.
Quote:
| <a href='".XOOPS_URL."/admin.php?xoopsorgnews=1'>XOOPS News</a>
www.polymorphee.com
www.xoopsdesign.com