Hi there,

Thank you for adding the attachment.

Please add the following CSS code to Appearance -> Customize -> Additional CSS:

/* remove single post featured image */
body.single-post .post-inner > a > img { display: none; }

This will remove the featured image on single blog posts.

Hi there,

To remove the featured image from the main blog page as well please replace my previous provided CSS with the following:

/* remove blog post featured image for summary and post */
body.single-post .post-inner > a > img,
body.blog .post-content > a > img { display: none; }

Thank you for adding the screenshot. The easiest option is to add a bottom border to each post with custom CSS. You can use the following Css to see what I mean:

/* blog page post bottom border */
body.blog .post-inner {
    border-bottom: 10px solid #e6e6e6;
    padding-bottom: 50px;
}

Adding an image to the bottom of each individual post is possible with custom CSS as well but I need to see the image to provide the right custom CSS for that.

You're welcome!