How To Change Apple ID Email
                     How To Change Apple ID 
Email ?
Here it's the solution on how to change 
apple id Email on iPhone:
Steps To Know
Step 1:
Visit My Apple ID.
Step 2:
Press Manage Your Apple ID and sign in to your account.
Step 3:
If you have an email address like the following: @me.com, 
@mac.com, or @iCloud.com, you are not allowed to change the 
email address used with your Apple ID.
Step 4:
Click the blue Edit button to change the email address 
associated with the Apple ID.
Step 5:
Hit the Save changes button.