Arkadaşım xml dosyasını açıp baksana..

<plugin active="1" executionorder="1">
            <title>Footer Addition</title>
            <hookname>global_start</hookname>
            <phpcode><![CDATA[if($vbulletin->options['reminder_footer']){
$vbulletin->templatecache['footer'] = str_replace($vbulletin->templatecache['footer'],$vbulletin->templatecache['footer'] . '<div align=center>Inactive Reminders By <a href=http://www.mished.co.uk/>Mished.co.uk</a></div>',$vbulletin->templatecache['footer']);
}]]></phpcode>
        </plugin>

Plugin yönetimine girin Footer Addition diye aratın ve pasif hale getirin.