How to noindex my policy page

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The thing is that I want to noinndex some pages. How do I do so?
I have tried a method on some youtube tutorial, but I do not know if my pages are noindex. How do I check that?
I have seen the help form and have find the article, but I do not understand. Kindly tell me by explaining this example- Suppose my page is . Also let me know how do I check if that has worked