In case you wish to retain the existing email address and add a new one, please do the following steps:
Log on to your Zoho account at: https://accounts.zoho.com/
, click on the 'Profile' tab >> 'Email Address' link and then on 'Add New Email' button
Enter a new email address in the text box and click "Add". It will get added as your secondary email address
Click on the 'Make Primary' text link of this new address. Enter your account password and hit the 'Make Primary' button
new email address you gave will get added as the primary address. Now
click on the 'Resend Confirmation Mail' button to receive the
confirmation mail again to your new email address.