The new Apple TV provides lots of options for bringing all sorts of content to your television, but not all that content may be suitable for everyone in your home. To deal with that, Apple gives you tools to control what can be downloaded and displayed on your TV. Unfortunately, those tools aren’t consistently applied across all content sources yet and don’t always work as expected. Even so, it’s better than nothing. Here’s a walkthrough of how these features work.
Apple TV’s tools for managing content are in the Settings app, under the Restrictions option. It would be nice if Siri would bring you directly here, but asking her to open either Restrictions or Parental Controls prompts a terse reply that you don’t seem to have an app by that name. You can use Siri to open Settings, because that is indeed the name of the app. Whichever method you use to get there, once you’re in Settings, you can go to General > Restrictions.
Read more here:: How to set restrictions on the new Apple TV