You can manage parental controls by logging into your Roku account at https://my.roku.com using the email address that's displayed on your Roku device under Settings->System->About. Note that those controls only affect The Roku Channel. Other services/apps may have their own controls that you'd have to manage on their websites.
"Note: These settings do NOT affect content within other apps. You will need to set Parental Controls within each one."
https://my.roku.com/account/pin
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