We receive this question a lot - your username (screenname) is tied to your email address. Meaning your username is your email address, or at least it should be. If you had changed your email address, and your username still reflects the old email address, we have a few options, included below:

You can create a new account, choosing a different username, if you use a different email address. (May not be what you want) 

Or, if you wish to create a new account with your same email address, we can delete your current account (there is a 2  day time delay between deleting an account and the ability to create a new account). Once the deletion process has completed, you may create a new registration with the email address that you want to use for both your username and email since they are tied together. Please note, your email address must be valid, as verification link may be sent to newly registered email addresses before account creation. 

Please submit a ticket through "Contact Us" button on this page,  if you wish to delete your current account.