Official Sharing Buttons at Blogger

If share buttons didn’t appear although you already setting it at the Page Elements (Blog Posts Gadget), then don’t worry. That is because you are having a modded template. Just Go to the Edit HTML page under the Design Tab , Check the “Expand Widget Templates” then find:

<p class='post-footer-line post-footer-line-3'>

 
Or if that is not there then find

<div class='post-footer-line post-footer-line-3'>

 
Or if that is not there then find

<data:post.body/>

after that, place the  following code  just below any of these lines[whichever is present in your template].

<div class='post-share-buttons'>
   <b:include data='post' name='shareButtons'/>
</div>

and Save your template.

source: http://www.bloggerplugins.org/2010/06/official-sharing-buttons-on-blogger.html (edited by. Dhilah)