Excerpts for Category pages

Hello,

I’m trying to change my category pages from displaying full posts to excerpts. I’ve tried heading to the “Category Template” page WordPress provided but it wasn’t what my blog had.

This what my category.php looks like:

<?php
	global $SMTheme;

	get_header();
?>

			<h1 class="page-title"><?php printf( $SMTheme->_( '' ), single_cat_title( '', false ) ); ?></h1>

			 <?php get_template_part('theloop'); ?> 

			<?php get_template_part('navigation'); ?>

<?php
	get_footer();
?>

I don’t know how to change the loop. Does anyone know how? Thank you.

My site.