I’ve the same problem after installing the Hellomini theme. I log in as admin and click through to System -> Configuration -> Design and the only sections I can modify are Package, Themes and Product Image Watermarks.
I’m trying to change the logo img src from a hyperlink to an image.
I’ve posted on the Magento forums and couldnt get a definitive answer there but to maybe modify app/design/frontend/default/yourtheme/template/page/html/header.phtml
[code]<?php echo $this->getLogoSrc() ?> '[/code]