First enable this option from your blogger settings and then I'll tell you how to use it.
- Log in to your blogger account.
- Now navigate to Setting >> Search Preferences
- Click on edit link under the Custom Robots Header Tags section as shown in below screenshot.
- Once you click on the edit link you will see many options. Simply tick on the options as shown in the below image.
- Now click on ""Save changes" button.
- You are done!
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