Where to put php template tags?

Hi. I just started using a plugin that allows me to assign a unique image to each of my categories, and then use a template tag to display that image within a post (anywhere inside the loop). I want to display it in the kicker or byline area, but we're not allowed to put php in the theme options. Here's the tag I want to use:

<?php c2c_the_category_image(); ?>

Where should I put this to make the image appear in the kicker or byline area?

Thanks!