Different image inside the single post

I have a question related to the posts page
On that page : https://www.drphysio.gr/blog/

On single post view I want to show different image and not the featured image.
How to do this?

Thank you in advance!


You can hide the featured image in the single post using this CSS code:

.single-post .entry-thumb {
    display: none;

Then, you can add another image in the post instead.
Hope this advice can help.