Facebook - How to create an account name
Users can personalize their accounts, so that they can easily share it as a link. Adding an account name is done through the settings below:
Facebook - How to create an account
https://www.facebook.com/editaccount.php?drop
Click on ACCOUNT menu option
Select ACCOUNT SETTINGS
Click on SETTINGS tab
Select User Name (if name taken a numeric suffix or optional names can be selected)