Step 1: Sign in to your Google Webmasters Account.
Step 2: Select the desired blog you wish to submit the sitemap for.
Step 3: At the left side of the page, click on Sitemaps under Crawl section.
Step 4: Now, at the top-right corner of the page, click on Add/Test Sitemap button.
Step 5: Add the below code in the provided text field.
atom.xml?redirect=false&start-index=1&max-results=500
This is the sitemap code for your blogger blog that you need to add.
Step 6: Press “Submit Sitemap” button.
Step 7: Refresh the page.
Congratulation! You have finished the process of submitting your blog sitemap.