Login to Google webmaster Tools and click on your particular blog name for which you want to manage sitemaps.
However, if you have not yet added your blog to webmaster tool then press the button ADD A SITE from the right top corner as shown in this screenshot. Once your blog is verified and listed in webmaster tools click on it.
add site to webmaster tools
Click on sitemap from the dashboard itself as shown in this picture or navigate sitemaps menu from the left sidebar under Crawl menu list.
Sitemap indexed status
However, you may directly visit https://www.google.com/webmasters/tools/sitemap-list and select any verified blog to see the list of sitemaps submitted manually by you or use this URL address by replacing indiaa.co with your own YourBlogURL.
Now, click on ADD/TEST SITEMAP text button. Finally, enter sitemap.xml in the text field and click on Submit Sitemap and you are done. Just refresh your browser to see your new sitemap in the sitemaps list.
Add Test xml Sitemap file
Once you submit your blog’s xml sitemap index file to the webmaster tool you will see on the same page the status of all webpages submitted and indexed.