I have tried all, but the thumbs (i want the first image from the post) is not displayed.
I use popular-posts in the sidebar by the widget.
I have add in the function.php of my theme this code:
add_theme_support( 'post-thumbnails' );
This is the website, in home page in the right sidebar is located the popular posts widget: Website
Here the img with the settings
Please, help me!!!!