Pictures miniature not appear in the Related Posts

Pictures miniature not appear in the Related Posts:

The images are presented in the related posts if these posts have featured images. Set the featured images for your post and you will fix this :)
Use the following instruction on how to set the featured images:

https://codex.wordpress.org/Post_Thumbnails

Is themes Diablo Fun supports thumbnails

http://i.imgur.com/062Uidw.jpg

Hi!
Yes, of course! Just set the featured image for your post like it is written here:
https://codex.wordpress.org/Post_Thumbnails
Use the following option: