I figured it out! For others:
Go into Appearance -> Editor.
On the right side, select content.php.
Change the following:
<div <?php hybrid_attr( 'entry-summary' ); ?>>
<?php the_excerpt(); ?>
</div><!-- .entry-summary -->
to:
<div <?php hybrid_attr( 'entry-summary' ); ?>>
<?php the_content(); ?>
</div><!-- .entry-summary -->
