You will need to start by logging in to your cPanel account. (https://cpanel.yourdomain.com/ with “yourdomain.com” being your website name)
Once logged in, in the email section, click on “Email Accounts”.
Then click on the desired email account, then the “Delete” button.
Check that the email address has been removed. You will see that the address is no longer listed, and a “Success” message will temporarily show confirming its deletion.