Hi Jasjiv,
Ana here, from the Shopify guru team. :)
It looks like in your case you may not have the code for featured images inserted into your theme code. Here's the code you'll need:
<img src="{{ article.image.src | img_url: '1024x1024' }}" alt="{{ article.image.alt }}">
You'll want to insert that into your blog.liquid theme file, as well as make sure that you have featured images attached to your blog posts for this to work.
Also, something to keep in mind: the '1024x1024' designates the size of the image you're pulling in, which you can change. Here's more info on setting size parameters: https://help.shopify.com/themes/liquid/filters/url-filters#size-parameters
Essentially, you're wanting to insert that code somewhere in between the blog post loop, which is found in between the {% for article in blog.articles %} and {% endfor %} code found in blog.liquid.
I recommend playing around with the placement of that code, until you find a position and size for the image that works for you.
Hope this helps guide you in the right direction!
Ana
