Techweez

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.

<b:if cond=’data:blog.pageType == &quot;item&quot;’>
<iframe allowTransparency=’true’ expr:src=’&quot;http://www.facebook.com/plugins/like.php?href=&quot; + data:post.url + &quot;&amp;layout=standard&amp;show_faces=false&amp;width=100&amp;action=like&amp;font=arial&amp;colorscheme=light&quot;’ 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