How can I add text on top of slideshow? [closed]

I’m confused as to what you are asking. Functionally, all you are required to do is add a DIV with a text block:

<nav role="navigation" class="main-nav"> ... </nav>
<div class="introtext">
<your content here>
</div>
<section class="content">

Are you asking how to do that as in what file to edit or are you asking how to make it dynamic with something like a custom post type?