How to enable Supervised User on Chromebook when the user already exists.

I did the following:
Set up new account on Chromebook
The child had been set up first.
I go to People, but I can't manage their pre-existing account.
We want to protect them from offensive material on the web.

How can I establish parent as the owner, the child as a supervised user without losing all their work and being screamed at by both parent and child ;-)  

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Koen Van WielinkBusiness Intelligence SpecialistCommented:
Not quite sure if this is possible. I was trying it on my own Chromebook but that's a managed device by our domain admin so I can't change the supervisor settings. But when I check it says these settings can only be changed by the owner of the device, which I assume is the child account. Are you not able to change these settings under this account?
Having said that, since this is a Chromebook and everything is basically stored in the cloud anyway, what work are you afraid parent and child might lose if you do a hard reset of the device?

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