Make a child theme by duplicating the theme folder via FTP – this stops it being accidentally updated
In the page.php file just comment out the ‘secondnav’ section as I have below:
<?php get_header(); ?>
<!--
<div id="secondnav" class="clearfix">
<span><?php _e('Popular Tags:', 'wpzoom'); ?></span>
<ul>
<?php wp_list_categories('show_count=1&number=8&title_li=&orderby=count&order=DESC&taxonomy=post_tag'); ?>
</ul>
</div>
-->
<div id="content">
<div id="main">
<?php while (have_posts()) : the_post(); ?>
<div class="post">
....
Hope that helps, drop me a message if you have any other problems!
Matt