Gemer Theme (Thumbnails does not appear on Home Page

I’m with these question. Same problem.

Here is my site:
Here is the theme:

some problem: here is my site: https://www.prsteam.net
here the theme: https://www.ads-software.com/extend/themes/gemer

Now I know how to solve the problem!:
Firstly you need to upload plugin “Meta Functions Shortcode” then in every post you will have a small window under and there you need to write:
in Name: screen
in Value: “link to your picture”

Its important to write word “screen” and do not upload any screen or nothing ?? and link of image shoud be square.

Enjoy!

I’ve posted corrected index.php source in another thread: https://www.ads-software.com/support/topic/320298?replies=4#post-1574522