Now you look at the page source and find your html widget. I just did a search for Merge Feeds in the source and found this:
HTML Code:
<li><!-- BEGIN TEMPLATE: vbcms_widget_static_page -->
<div class="cms_widget">
<div class="block">
<div class="cms_widget_header">
<h3><img src="images/site_icons/html.png" alt="" /> Merge Feeds</h3>
</div>
<div class="cms_widget_content widget_content">
<BIG><h1><b>Merge Network</b></h1></BIG>
So, your template is called vbcms_widget_static_page