Here’s a list of things you can do to set up and troubleshoot parental controls on a smart TV:

1. Check if the smart TV is connected to the internet.
2. Find and open the parental control settings in the smart TV’s menu.
3. Create an account with password protection and configure the desired levels of parental control for each user.
4. Restrict access to certain apps, websites, or other contect with built-in age-level settings.
5. Check for any app updates to ensure the latest parental control options are available.
6. Turn on automatic software updates to ensure the latest parental control updates are applied.