@Luddite wrote:You cannot. Just delete the email addrss associated with your current account and create a brand new one.
FYI, there is a possibility to change username through Moderators_Team.
Please, read this: click here
Your way of creating a new Community username is also acceptable solution! 
You will need to send a private message to a Moderator_Team and ask them to change it for you! Make sure you are using the same email in Community as in your Self-Serve account, so that rewards earned applied correctly.
Here is the link: click here
In your message, please provide your name, Public Mobile account number or phone number and PIN.
Good luck! 
Contact Support hours of operation:
Monday - Friday 9AM (EDT) - 9PM (EDT) Saturday - Sunday 9AM (EDT) - 7:30PM (EDT)
You will receive a response within an hour, if you are lucky OR it might take up to 48 hours, if your luck is run out!
