To change the email address on your Nintendo account, please follow these steps:

• Log in to your Nintendo account here.
• Select the “Sign-in and security settings” tab from the list on the left.
• Locate the “E-mail address” section and click “Edit”.
• Enter your new e-mail address and click “Submit”
• Open your mailbox. An email from Nintendo support will be sent there. If you don't receive an email, make sure to check your spam folder.
• Enter the verification code included in the email you received and click “Submit”

Good job! Your email address has been changed successfully.