You need to set featured image for each of your posts. The following article has detail explanation.
The above shortcode I provided includes the featured image.
Please see screenshot http://prntscr.com/7jlrkg
In your case, you only need to change the
Only elements that appear in this screenshot http://prntscr.com/7jlrkg is possible. Otherwise, it is custom coding and Sorry we do not provide support for custom coding.