This article explains how to access and set up parental controls for a Firestick through the Amazon FreeTime app.
How do I enable and disable parental controls on Amazon Fire TV Stick Max?
Firestick is a TV streaming device that lets you access your Prime Video content, use apps like Netflix and Hulu, and even play games. Firestick comes with basic parental controls built in. All you need to know is your Amazon Parental Control Personal Identification Number (PIN). If you haven’t set up a PIN, head to the Parental Controls section of your Amazon account.
Here's how to enable parental controls on a Firestick:
Switch your TV input to your Firestick and go to Settings.