Step: 1  Sign into Blogger > Design > Edit HTML
2. 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..

 <data:post.body/>
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> 
Note: If you're using Magazine style blogger template, You can find the data:post.body line TWO TIMES.. So, try in both ways and find out which one is working..and remove the other one.

Be aware: If you still don't see it in your Blog, Make sure..you activated it by going to
Blogger Dashboard > Design > Click the 'edit' button of the Blog post section.