@Anonymous User unlike Prime Video and Netflix there's no ability to create profiles on NowTV.
You can however set a parental pin to your account to prevent children accessing adult content and a payment pin to prevent them making purchases of passes.
https://help.nowtv.com/article/change-payment-pin-parental-pin-settings
If you're still not happy to have the children using your account you'd have to set up a completely different one for them which isn't ideal for a number of reasons with the main one being you'd have to log in and out of the different accounts each time you use them on your devices.
