Here’s my take on this. It makes sense to want to manage what your kids are watching on a new device. I think there might be a mix-up, though, as tools designed for cell phones generally aren’t compatible with streaming players like Roku. They run on very different operating systems.
The good news is that you can achieve your goal using Roku’s built-in features. You can set a PIN through the Roku account settings to restrict adding channels or making purchases. Furthermore, most individual streaming apps like Netflix, YouTube, and others have their own dedicated parental controls and kids’ profiles that you can configure. It’s a different approach, but it gives you solid control over the content on that specific device.