After your initial username modification you are just permitted to alter it once, according to the guidelines and standards of Facebook.
How To Find Out Facebook Username
Get a New URL.
Action. 1 Log in to Facebook.
Action. 2 Clear the URL bar, and type in "www.facebook.com/username." Select from the list of offered names, or check the box next to the empty field to get in a customized username.
Action. 3 Click the "Examine Schedule" button, and click the "Validate" button to complete the procedure.
Modification Your Existing URL.
Action. 1 Click the "Settings" button at the top of the Facebook site.
Action. 2 Click the "Modification" link beside the "Username" area. Highlight your existing user name and press the "Erase" or
"Backspace" button to remove the existing name, and enter a brand-new username.
Action. 3 Click the "Examine Accessibility" button, and click "Verify" to complete the switch How To Find Out Facebook Username.