I gave my child my macbook. How does she get her own apple ID?
I gave my child my macbook. Every time I change my password, I need to tell her. How can she get her own ID and Password?
Manage your Apple ID primary, rescue, alternate, and notification email addresses - Apple Support
iTunes- How to set up an Apple ID within iTunes
Frequently asked questions about Apple ID
Be sure your child meets the age requirement to have an Apple ID. It should be discussed in one of the above links.