I got a new CC that assigned me a mileage plus number. I also signed up for a new mileage plus account because I didn't know I was given a number. I want to delete one of the accounts. They both have 0 balance. The reason I want to do this is because both are associated with the same email address and so I can't just log in to the website using my user name/password. I have to have my number on me.

How do I do this?