How do I add sponsor ads to wp-portal theme?

The WP-portal theme has a spot to add sponsors to the sidebar, but it doesn’t say how to do it. I tried editing the HTML in cPanel, but whenever I do any updates at all to either the widgets or the theme, the sponsors panel disappears completely from my site.

In the theme editor, in the sponsors.php file, there are 4 lines that look like this:

<img src=”<?php bloginfo(‘template_url’); ?>/images/ad.gif” alt=”Sponsor” />
<img src=”<?php bloginfo(‘template_url’); ?>/images/ad.gif” alt=”Sponsor” />
<img src=”<?php bloginfo(‘template_url’); ?>/images/ad.gif” alt=”Sponsor” />
<img src=”<?php bloginfo(‘template_url’); ?>/images/ad.gif” alt=”Sponsor” />

I know where to add my href link (#), and I’ve tried a couple different combinations for the img src (/images/ad.gif) and (<?php bloginfo(‘template_url’); ?>/images/ad.gif), but I’m getting nowhere fast. Does anybody know how to make this work?