Can’t get rid of bullet in title on sidebar

I’m having some trouble getting rid of a bullet on one of the titles on my website: https://www.complete-diet-guide.com

Here is the code that is present in the sidebar.php file:

<ul><h2><?php _e('About Us'); ?></h2>
<p>Welcome to the premier diet and health website on the Internet.  This resource was created to help you make better informed decisions before going on a diet or taking any supplements.</p>
</ul>
<br />
<?php if (function_exists('wp_theme_switcher')) { ?>
			<h2><?php _e('Themes'); ?></h2>
				<?php wp_theme_switcher(); ?>

<?php } ?>
			<?php wp_list_pages('title_li=<h2>' . __('Weight Loss Articles') . '</h2>' ); ?>
<br />
			<h2><?php _e('Archives'); ?></h2>
				<ul>
				<?php wp_get_archives('type=monthly'); ?>
				</ul>
<br />
<h2>Search The Archives</h2>
			<div id="searchdiv">
		<form id="searchform" method="get" action="">
		<label for="s">Search this site:</label>
			<input type="text" name="s" size="20"/>
<input type="submit" name="sbutt" value="Go" />
		</form>
		</div>

<br />
			<h2><?php _e('Categories'); ?></h2>
				<ul>
				<?php list_cats(0, '', 'name', 'asc', '', 1, 0, 1, 1, 1, 1, 0,'','','','','') ?>
				</ul>
<br />

							<?php get_links_list(); ?>

				<h2><?php _e('Meta'); ?></h2>
				<ul>
					<?php wp_register(); ?>
					<li><a href="<?php bloginfo('rss2_url'); ?>" title="<?php _e('Syndicate this site using RSS'); ?>"><?php _e('<abbr title="Really Simple Syndication">RSS</abbr>'); ?></a></li>
					<li><?php wp_loginout(); ?></li>
				</ul>
				</li>

		</ul>
	</div>

Any ideas on how to fix this?

Thanks!