In Blogger Blogs with the .blogspot.com sub domain, the sitemap is in a simple location ie :
http://YOURBLOG.blogspot.com/sitemap.xml
But on other blogs ie blogs on custom domains doesn’t have a sitemap like the above URL. Instead you should use the following URL :
http://YOURBLOG.com/atom.xml?redirect=false&start-index=1&max-results=1000
Now, Let’s mention the sitemap on robots.txt. For That Go To Blogger -> YOUR BLOG -> Settings -> Search Preferences.
Click on Edit button near Custom robots.txt and add the following in the textbox:
User-agent: *
Disallow: /search?q=*
Disallow: /*?updated-max=*
Allow: /
Sitemap: http://www.subinsb.com/atom.xml?redirect=false&start-index=1&max-results=1000
Replace The yellow background URL with your blog’s sitemap URL and click on Save Changes button :
When the search engines crawl your site, they will get the sitemap URL from robots.txt and they will index all the URL‘s in the sitemap.
If you have any suggestions/problems/feedback say it out in the comments, I will help you.