To change your register email address, please follow the below steps:
Sign in your account;
Choose "Email Verification", then click on "Click here to receive verification code" to receive a verification code in your current registered email;
Enter the verification code you received;
On the next page, enter your new email address, and also click on "Click here to receive verification code" to receive a verification code in your new email;
Enter the verification code and click on "Submit".