Edit User Name Conirmation Code On Mobile Number

I am in the process of editing my Username of my facbook page. This process required the confirmation from mobile.

But i am not getting any confirmation code on my mobile, please help how i can do this..

 

There is nothing we can do. All you can do is report it to FaceBook.

 

I am not getting any confirmation mail, can anyone tell me where i have to save my mobile except the profile.