From the management point of view, how do I register as an administrator and to create a school url for my teachers and parents to sign in?
What Canvas server are you looking for an administrator role on?
You will not be able to have an administrator role on the "Free for Teachers" version of Canvas ( https://canvas.instructure.com ). Teachers all need to register their own accounts and create their own classes there.
To have a separate Canvas instance for your school with its own URL where you would have an administrator role, your school would need to get a license for Canvas from Instructure.
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