To edit your User profile in your account click on ACCOUNT SETTINGS in the top right-hand corner of your dashboard web page and then click the white YOUR USER PROFILE tab in the vertical blue bar on the left.
Here you will be able to edit the email you use to log-in to your account and change your account password. These changes will take affect once you've logged out of your account.
NOTE: This log-in email is also the email where all account notifications are sent.