Step 1 – Go to Google Search Console Web master (url is available in screen-shot).

Step 2 – Verify your Property from your DNS provider.

Step 3 – Follow the step that are given in Message

 Step 4 РEdit your robots.txt from your hosting server.

Generally it’s find at root directory. Code will look like this:

User-agent: Mediapartners-Google

User-agent: *
Allow: /


Step 5 – Fetch as Google

See the result :