To change your registered email address, Please follow the steps

Step 1

Go to Account & Settings Page to change your password.

Step 2: 

You will be redirect to “Account & Settings” page. 

There is "Change Email ID" form displayed below Change Password form.

Please note: In case you have forgotten the old password, follow the following instructions: 

How do I recover my forgotten/lost password?

Step 3: 

Please enter your new Email Address and your Current Password in "Change Email Id" form.

and click on "CHANGE EMAIL" button