How can I set up Parental Control on the TCL TV?

Here is the instruction for the TV C825 for your reference:

Press the Setting button on the TV remote.
Select System-->Parental Controls on the popping-out menu.
After inputting the password, you could configure the Parental Control rules for your TV.

If you have a concern about the instruction, please feel free to call the TCL hotline for further help.