How to block and unblock indexing the website?

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There’s about few moves to block and unblock indexing the website so if you actually have no idea how to do it, don’t worry, we’re here to help you! 

All you must do is go to the Settings overlap and then Reading.

You will see the list of some options but what you’re interested in SEARCH ENGINE INDEXING. So if you want to indexing, tick it and if you want to block untick it! Done! :) Remember about saving your changes!