Roku doesn't have traditional parental controls, but you can create a four-digit numerical Roku Channel Store PIN that will be required to add new channels to your Roku player. This gives you more control over the kind of content that gets added to your player. To create a PIN number:
Sign in to your Roku account here.
Note: Setting a PIN does not allow you to control movie and TV shows that can be viewed on your Roku player by maturity rating.