Robot.txt tag and robot header tag

Please example on how i can set my blog robot.txt tag and robot header tag I need it in form of example

Any problem with the default Blogger robot.txt file?

they are disabled in my blog and I want to set it

When I try searching my blog on Google I won’t see any post or description

It’s the custom that is disabled, not the default. Do NOT tamper with anything there except you know what you are doing.

Your robots.txt file is enabled by default and you can see it live here : https://sesgist.blogspot.com.ng/robots.txt

Have you submitted your blog sitemap to google webmaster ?

I did it when I have no experience in it so i can’t remember what I did there

read this : http://www.ogbongeblog.com/2016/02/add-blogger-sitemap-xml-to-google-webmaster-bing.html

Please how can I create my sitemap like User_agent: Mediapartners-Google Disallow:

User - agent: * Disallow: /search Allow: /

Sitemap: https://sesgist.blogspot .com/atom.xml?redirect=false&start-index=1&max-results= 500

Because i try searching my robots.txt file https://sesgist.blogspot.com/robots.txt but the page can’t be found