Pl Facebook How To Re - Change The Username On The Facebook?

How to re - change the username on the Facebook? - pl facebook

Please help. How do I reset the username on the Facebook application that appears in the compound. Example:

Old usernames ...
www.facebook.pl / people /-name / mi ...

... I changed to:
www.facebook.pl / people / my.nick

Let me now return to the old name with the number. How does it work?

The website http://www.facebook.com/username/ enter your user name that was found
Now you can direct your friends www.facebook.pl / people / my.nick
I can not do anything ..


Thank you for your help.