How to get the nivo slider to show excerpt [closed]

I’m not quite clear if your saying you can call the excerpt but it’s not showing up or if you don’t know the function to show the excerpt.

If it’s the former it might be a CSS issue, if the latter the following should do the trick:

<div class="content-summary">
     <?php the_excerpt(); ?>
</div>

You can read more about the_excerpt function in the WordPress Codex.