Changing email

Hello, I've been trying to change my email under settings but I have not received any confirmation email.
I'm trying to delete my Prezi account but I have already deleted the email i signed up with, so this makes deleting my account impossible because the confirmation notice will be sent to a non-existing account. So I'm trying to register my new email so i can receive the confirmation notice in order to complete the process of deleting my Prezi account.
My Prezi is linked to FB, that's how I've been able to log on