how to change facebook username after a limit

Nowadays many facebook user are facing a problem. 

That, they cant change their name after a limit. For 

them i suggest to use this link for change name after 

limit. 
but here is the trick to change your facebook username even after you have crossed the limit.

step 1: go to the link https://www.facebook.com/help/contact/245617802141709 

step 2 : you will see a form .
step 3 : then fill up the form with right information
 step 4 : you will see a option in this form that, about 

               giving ur id.Imagine, u  havent id card. No 

                problem just upload ur fbprofile picture. 

 step 5: after filling the form click on send  and with in 

 

              32 hours u will get your feedback.