Question

My question is: How do you change the password of your child account on Xbox live using the parent account. I got an account that is a parent of the account that I bought and they guy who sold me it said he didnt know how to do this either so that's why I have come here asking for your guys help. If you know anything about this or have an idea of how to do this please reply.

 

You have to put the child account as an adult.