How do I set up parent controls on my guest wifi only?

I believe it's all or nothing. 

Hi Syreeta, 

Thanks for taking the time to contact us via the Community. It's lovely having you on board with us in the Forums. ⭐

You can't directly apply parental controls to a guest network I'm afraid. You can view more on this here. 

Let us know if you have any further queries or questions.

Many thanks,