This article is in the chain of optimum guide posts to blogger.
Blogspot has 2 forms of Sitemap, the first is kind of sitemap to submit to Google Webmaster Tools (sitemap for the Googlebots), the second is type sitemap.html for users.
How to create a sitemap for the Googlebots, into google webmaster tools, navigate to submit sitemap add this code
atom.xml?redirect=false&start-index=1&max-results=500
For the users you need to create the diagram easier to use
Login blogger >> New Page >> Then you switch to HTML mode and insert the code
<script style="text/javascript" src="https://dl.dropboxusercontent.com/s/32ekcgpuijpw5k2/blogtoc-min.js"></script>
<script src="http://s5tricksblog.blogspot.com/feeds/posts/default?max-results=9999&alt=json-in-script&callback=loadtoc"></script>
<script src="http://s5tricksblog.blogspot.com/feeds/posts/default?max-results=9999&alt=json-in-script&callback=loadtoc"></script>