Hi tgtonyak,
Please install a child theme so any changes you do make do not affect the core x theme as when you go to update you will remove any files you have edited.
Now that that is out of the way you will need to add a file to the root child theme folder E.G. my-template.php
In this file add the below:
<?php
// =============================================================================
// TEMPLATE NAME: YOUR THEME NAME
// -----------------------------------------------------------------------------
// Handles output of content left, sidebar right pages.
//
// Content is output based on which Stack has been selected in the Customizer.
// To view and/or edit the markup of your Stack's index, first go to "views"
// inside the "framework" subdirectory. Once inside, find your Stack's folder
// and look for a file called "template-layout-content-sidebar.php," where
// you'll be able to find the appropriate output.
// =============================================================================
?>
<?php get_header(); ?>
<div class="x-container max width offset">
<div class="x-main left" role="main">
<?php while ( have_posts() ) : the_post(); ?>
<?php x_get_view( 'renew', 'content', 'page' ); ?>
<?php endwhile; ?>
</div>
<aside class="x-sidebar right" role="complementary">
</aside>
</div>
<?php get_footer(); ?>
You have just uploaded a custom theme template file which you can select on the page templates in the page options. Place any custom content you want in the <aside> </aside>
Kindest regards,
Samuel Rose.