Code that you will need to copy:
<b:if cond=’data:blog.url == "http://katelynlesk.blogspot.com/2016/01/how-treat-free-challenge-facebook-group.html"’>
<meta content=’https://4.bp.blogspot.com/-t–OhluUJF4/Vo9GZV6GVHI/AAAAAAAAIe0/irQyWPpkXNk/s320/20151229_103846.jpg’ property=’og:image’/>
</b:if>
Copy this code word for word- every symbol is important! You will need to replace http://katelynlesk.blogspot.com/2016/01/how-treat-free-challenge-facebook-group.html in the code with the link to your specific blog post and https://4.bp.blogspot.com/-t–OhluUJF4/Vo9GZV6GVHI/AAAAAAAAIe0/irQyWPpkXNk/s320/20151229_103846.jpg with the link to the image that you want to be the thumbnail that shows up when pasting the link to your blog post in social media. The link to the image can be found in the blogger editor of that specific post as described in the video tutorial.