To change the email ID, log in to your account and follow these simple steps:
Steps on the website:
1) Visit 'My profile'
2) In the 'Personal information' section, click the 'edit' button next to the email id option
3) Add the new email ID
4) Enter the OTPs received on your old & new email ID
6) Click 'Save'
Please note that you will not be able to update your email ID without access to your old email ID.