How to make sitemap on Blogspot and add sitemap to Google index?

Nowadays, for Google indexing, in Google Search Console we must to add sitemap file.

First, make string URL, such as:

http://blog-name.blogspot.com/atom.xml

or:

http://blog-name.blogspot.com/rss.xml

Second, register blog at Google Search Console.

Then go to there:

https://www.google.com/webmasters/tools/submit-url?continue=/addurl

Select Add Sitemap. Then select "Index->Sitemaps->Add a new sitemap"

Then write string URL to field and click Submit.