excerpt issues

Hello,

I am running a theme from Kubasto (responsive theme) and on the blog summary page I am trying to show excerpts.

When I find the index.php file I cannot find the code to chance “content” to “excerpt” to do so.

here is a copy of all that is in the index.php file.
—
<?php
/**
* @package WordPress
* @subpackage Website_Theme
* @since Website 1.0
*/
?>

<?php
get_header();
get_template_part(‘slider’, ‘index’);
get_template_part(‘breadcrumbs’, ‘index’);
?>

<section id=”content” class=”<?php Website::contentClass(); ?>”>
<?php get_template_part(‘loop’, ‘index’); ?>
</section>

<?php
get_sidebar();
get_footer();
?>
—

I have tried simply adding this line to the bottom:
<?php the_excerpt(); ?>
But that does not do the trick.

I have also installed a plugin “rich text excerpts” and whilst that adds an execrpt box to my post editor pages, nothing shows up at the front.

The dev site can be found here: https://dev.trafficact.com.au/blog/

Can anyone advise what I am doing wrong?

Jen