How do I change my primary email address

I know I have to verify my email primary email address but the problem is my primary email address does not exist anymore. Now, Real support, could you assist me to change my email address which is now my secondary email address.

secondly, about my billing, I have place the same card number to it, I wanted to delete one of the card but I do not have the rights to do that. Could the support delete anyone of it

thanks