How to add NOINDEX NOFOLLOW in product page for magento 2
I need to change my meta tag to NOINDEX and NOFOLLOW for particular page (especially in product detail page) in magento 2. I have tried adding
<head>
<meta name=”robots” content=”NOINDEX,NOFOLLOW”/>
</head>
and also
<reference name=”head”>
<action method=”setRobots”><value>NOINDEX,NOFOLLOW</value></action>
</reference>
In layout update xml but not changing from default how to fix the issue.
P.S.:I need to update via magento 2 backend.