1) go to Design > Edit HTML
2) put a mark on Expand Widget Templates
3) find this code line : <data:post.body/>
4) put this code :
<p>
<div style='width:215px;'>
/*LIKE BUTTON*/
<div style='60px; float:left;'><iframe allowTransparency='true' expr:src='"http://www.facebook.com/plugins/like.php?href=" + data:post.url + "&layout=button_count&show_faces=false&width=55&action=like&font=arial&colorscheme=light&height=21"' frameborder='0' scrolling='no' style='border:none; overflow:hidden; width:55px; height:21px;'/></div>
/*SHARE BUTTON*/
<div style='width:150px; float:right; padding:0px;'><a expr:share_url='data:post.url' name='fb_share' rel='nofollow' type='button_count'/><script src='http://static.ak.fbcdn.net/connect.php/js/FB.Share' type='text/javascript'/></div>
<div style='clear:both;'/></div>
</p>