first step, on HTML editor your blog activate 'Expand Template Widget', next step, search script
<b:include data='post' name='post'/>
and replace with the following script<b:if cond='data:blog.url == &http://YourBlogName.blogspot.com/search?max-results=500&'>
<li><a expr:href='data:post.url'>
<data:post.title/></a></li>
<b:else/>
<b:include data='post' name='post'/></b:if>
<li><a expr:href='data:post.url'>
<data:post.title/></a></li>
<b:else/>
<b:include data='post' name='post'/></b:if>
use the following link to view the index
<a href='http://YourBlogName.blogspot.com/search?max-results=500'>Index</a>