How do I remove a pin from a child account?

I set up a child account on a desktop computer that has Windows 10 - it has an administrative account, which has a password as I want the user of that to be the only one to be able to access that account.


Then there is a child account which I called "Guests", during the setup many moons ago I set up a pin to that account (I'm sure I had to, as I didn't see an option to have a password-less 'child' account) but I want that account to have no pin.

Is there any way to change the 'child'-account to be completely password-less, and if so are there any good and simple step-by-step instructions?