The email ID I want to change to says, it is not available though it is the email ID I use. How do I make the change?
Thanks for reaching out to Apple Support Communities. We see you're having some issues with your Apple ID, and we'd like to help. We also see you came from the article: Change your Apple ID
The following link may help you learn more About your Apple ID email addresses.
If you still have issues, please Contact Apple Support.