hello all and welcome to herosofnet again
i will teach you how to add facebook share button to your blogger it will show on all posts
ok..
so ... Login to your Blogger Dashboard and navigate to Layout > Edit Html
and check the check box which says “Expand widget templates and looking for this code
<div class='post-header-line-1'/> when you find that code you should past BUTTON CODE after that code
BUTTON CODE
<div style="float:right;padding:4px;">
<a expr:share_url='data:post.url' name='fb_share' rel='nofollow' type='box_count'/>
<script type="text/javascript" src="http://static.ak.fbcdn.net/connect.php/js/FB.Share"/>
</div>
if you don't find
<div class='post-header-line-1'/>
you can looking for this code
<data:post.body/> and past button code before that
i hope you understand that and if you have any problem send me coment and i will help you