Add the Google +1 Button to Your Blogger Blogs

   

 

 

6.  If you want the button to appear below blog posts then add the button code just below <data:post.body>

    7. Save your template to see it working. Have fun! :>

It will appear like this in search results,

Alternative Method

Source: http://www.mybloggertricks.com/2011/06/add-google-1-button-to-your-blogger.html