Unfortunately for most devices there is no way for you to use parental controls at this time. We plan on implementing this feature in the future, but for now you will have to monitor what is being watched on our channel. We apologize for the inconvenience.
Xbox One and Xbox 360 are the only exceptions. I’ve provided a link here for your reference: https://support.xbox.com/en-US/xbox-360/apps/tubi-tv-setup#d3a531f96aa543898f5c4bf97bfef67a
On another note, on https://tubitv.com/ you must have an account and your age must be approved to watch R rated content, so you can log out when you want to be restricted.