Add Robos.txt for Blogger

1. Go to your blogger blog.
2.  Navigate to Settings >> Search Preferences ›› Crawlers and indexing ›› Custom robots.txt ›› Edit ›› Yes
3. Now paste your robots.txt file code in the box.
4. Click on Save Changes button.
5. You are done!

You will have to generate your sitemap.
Sitemap Here is the list of Sitemap Generating Website, Create your Sitemap from on of them.

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