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First of all, makes sure that your blog has a Facebook Page like this one - TechGau.If you don't, then please make one here - Facebook Page.
Once you have a Facebook Page for your blog, now to add the Facebook like box below each of your articles or blog posts.
Look for this code in your Blogger Template -
<data:post.body>
<iframe allowTransparency='true' frameborder='0' scrolling='no' src='http://www.facebook.com/plugins/likebox.php?href=http%3A%2F%2Fwww.facebook.com%2Ftechgau&width=600&colorscheme=light& show_faces=true&stream=false&header=false&height=180' style='border:none; overflow:hidden; width:600px; height:180px;'/>
You can edit the size of the Facebook Like Box by changing the "600" to your desired width.Hope this article helped you, make sure you like us on Facebook!