MobilePress comes out with a very plain mobile theme, which can be customized with some basic HTML and CSS. I’ll show you how to customize your MobilePress theme by adding a drop down category list to MobilePress’s default theme. You don’t need a plugin for this job.
Login to your ftp or file manager. Go navigate to /wp-content/plugins/mobilepress/system/themes/default or whatever theme you’re using with your MobilePress.
Add following snippet to the last line of your header.php file or in the first line of footer.php file:
<form action="<?php bloginfo('url'); ?>" method="get">
<div> <strong>Categories:</strong> <?php wp_dropdown_categories('show_count=0&hierarchical=0&orderby=name'); ?> <input type="submit" name="submit" value="View" /> </div>
Save the file and that’s it!