I don't know what skin you are using but you will find the following at the bottom of each skin's main.php

<div id="pageFooter">
	<p class="baseline">
		Original template design by <a href="http://fplanque.net/">Fran&ccedil;ois PLANQUE</a>.
		<?php
			// Display additional credits (see /conf/_advanced.php):
 			// If you can add your own credits without removing the defaults, you'll be very cool :))
		 	// Please leave this at the bottom of the page to make sure your blog gets listed on b2evolution.net
			display_list( $sponsored_links, T_('Credits').': ', ' ', '|', ' ', ' ' );
		?>
	</p>
</div>

I wouldn't delete it, I would simply edit the conf/advanced.php refered to and use it as a credit resource for B2Evolution and anything/anyone else who you would like to credit or thank. For example, I added my hosting company as an additional credit

Also... please refer to the following post which explains how to fix a bug in the list rendering for the Credits.

http://forums.b2evolution.net/viewtopic.php?t=8959