This is how you do it without messing yourself up with long processes.
1. Login to your Blogger Account and go to Layout > Edit HTML and click on the check box which says “Expand Widget Templates”
2. Look for <data:post.body/> and immediately after that place the following code.
<iframe allowTransparency=’true’ expr:src=’"http://www.facebook.com/plugins/like.php?href=" + data:post.url + "&layout=standard&show_faces=false&width=100&action=like&font=arial&colorscheme=light"’ frameborder=’0′ scrolling=’no’ style=’border:none; overflow:hidden; width:450px; height:40px;’/>
</b:if></p>
3. Save the template and you should see the Like Button Below each of your posts.
You may change layout=standard to button_count for a numerical impression or action=like to recommend it you want it to display recommend instead of like, you can also edit show_faces=false to true if you want the like to show faces, colourscheme=light to evil, etc
