To add share button to your blogger. Follow these simple steps:
Sign into Blogger > Design > Edit html
(Click the expand widget button)
Add this line anywhere you want the widget to appear
<b:include data='post' name='shareButtons'/>
Normally, in most templates, you can add it after this line..
<p class='post-footer-line post-footer-line-1'>
If you don't find that above line in your template....
Find this one.
<p><data:post.body/></p>
and add this code after that line..
<p><data:post.body/></p>
<div style='clear:both; padding: 10px 10px 10px 10px;'> <b:include data='post' name='shareButtons'/> </div>
Finally..Save the template!