Hi there,
The point is that you can not add additional information to a page which is set as a main blog posts page in Settings > Reading the section in your Wordpress installation.
This can be achieved via customization. The implementation will be outside of our support scope but we will try to give you the guide:
You will need to add the Child Theme to your installation.
Then kindly add the code below to functions.php file of your child theme:
function custom_landmark() {
if(is_home()): ?>
<div class="custom-landmark">
<div class="x-container max width">
<p>SOME TEXT CONTENT HERE</p>
</div>
</div>
<?php endif;
}
add_action('x_before_view_ethos__landmark-header','custom_landmark', 30);
Replace SOME TEXT CONTENT HERE
with whatever code you want to add above the blog page with or without the container.
Thank you.