You can’t. You need to contact EA and ask them to delete your account for you.
You can delete your FIFA account by going to the “My Account” section of the game and clicking on the “Delete My Account” button.
To delete your FIFA account, please go to the following link: https://www.easports.com/fifa/account-managementOnce you get there, you will need to log in with your EA Account email and password. Once you are logged in, click on “Delete My Account” at the bottom of the page. You will then be prompted to enter a confirmation code which will be sent to the email address that is associated with your EA Account.
You can’t delete your EA account on PS4. You’ll need to go into the PSN store and cancel your subscription through there.
EA does not allow for users to change their EA ID.