Remove Text from Source Code

Hello

I would like to be able to remove some text from a theme I have downloaded.

I can see it in the Source code, but it is not available in the “Editor” menus. I understand that WordPress creates info as it is requested and so there is no real HTML editor, so how can I edit text that is ’embedded’ in the theme’s code.

Below I have pasted the text I what to remove as it appears in the source code, the text in question is “Show All” . I think I could edit the CCS so that the text appears white, but this could effect the rest of site where this div occurs.

<div class="row">
<div class="span12"><div class="title-box clearfix "><h2 class="title-box_primary">Services Overview</h2></div><!-- //.title-box --></div>
</div><!-- .row (end) -->
	<div class="clear"></div>
</div>
			<div class="filter-wrapper clearfix">
				<div class="pull-right">
					<strong>Categories: </strong>
					<ul id="filters" class="filter nav nav-pills">
												<li class="active"><a href="#">Show All</a>

					<div class="clear"></div>
				</div>
			</div>

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Any help much appreciated

Thanks

Sam