I am assuming you wanted to change your profile email address. Here is the post from Jason Long (Community Manager).
Your email address is the key field that we use to identify you with your company in our CRM. If you need to change it, it can be done by emailing your account manager/partner manager and requesting a change.
I request you to do a simple search before asking the question. This question was asked couple of times! Also, please can you change the spelling in the subject/header.
