Template >> Edit HTML >> and search for the <data:post.body/>. After finding the tag just below it paste the following piece of coding.
<b:if cond='data:blog.pageType != "static_page"'>
<b:if cond='data:blog.pageType != "item"'>
<div class='readmore'>
<a expr:href='data:post.url'>Read More</a>
</div>
</b:if>
</b:if>
Past Below Code/Above </head>
<script type='text/javascript'>
var thumbnail_mode = "no-float" ;
summary_noimg = 400; /* Summary length if no image*/
summary_img = 300; /* Summary length with image*/
img_thumb_height = 200; /*Image Height*/
img_thumb_width = 200; /*Image Width*/
</script>
<script type='text/javascript' src='http://netoopscodes.googlecode.com/svn/branches/Js%20files/auto-readmore-blogger.js' ></script>
