If your email address has changed there is an easy way to update it in My Settings.
Enter in the new email address and your current password
A notification will pop up advising you of that a confirmation email has been sent to the new address.
Once the email has arrived, click on the blue button to update/confirm your new email address.
You will receive a notice that you email address was successfully updated. After that you will be taken back to the login page where you will need to log in with your new email address.
NOTE: For security reasons, Administrators cannot change your email address or password. Only you can.