Changing my username
Your username is your unique identifier on Freelancer.com. As indicated upon signing up, it cannot be changed once your account is created.
Closing your account, and creating a new one will be your best option if you want to have a different username. Should you go with this option, make sure to use a different email address as this information should be unique in every account.
Note that your display/public name, is different from your username. Your display name is your first name and last initial (for personal accounts) or your elected company name (for corporate accounts).
In this sample of a personal account, (1) Chuck B. is the display name and (2) heychuck is the username.