Do not know what version as you did not state:
Find in your includes/templates/your_template/common/tpl_header.php file
Ver 1.3.x
Code:
<!--bof-branding display-->
<div id="logoWrapper">
<div id="logo"><?php echo '<a href="' . HTTP_SERVER . DIR_WS_CATALOG . '">' . zen_image($template->get_template_dir(HEADER_LOGO_IMAGE, DIR_WS_TEMPLATE, $current_page_base,'images'). '/' . HEADER_LOGO_IMAGE, HEADER_ALT_TEXT) . '</a>'; ?></div>
<div id="taglineWrapper">
Ver1.2.x
Code:
<td valign="middle" height="<?php echo HEADER_LOGO_HEIGHT; ?>" width="<?php echo HEADER_LOGO_WIDTH; ?>">
<?php echo '<a href="' . zen_href_link(FILENAME_DEFAULT) . '">' . zen_image($template->get_template_dir(HEADER_LOGO_IMAGE, DIR_WS_TEMPLATE, $current_page_base,'images'). '/' . HEADER_LOGO_IMAGE, HEADER_ALT_TEXT) . '</a>'; ?>
</td>
<td align="center" valign="top">
Where the '<a href="' . zen_href_link(FILENAME_DEFAULT) . '">' is add your url like:
Code:
'<a href="http://www.your_full_url.com">'
Pay particular attention so as not to drop a required quote or period.
Bookmarks