Facebook name confirmation problem

Hey guys,
Today I was asked by Facebook to confirm my name.
So I had two options, to confirm it or to update my name.
I was on my mobile phone and I accidentally clicked confirm, but I actually wanted to update it because it's not my real name.
As I clicked it, I got to one another question, to send my id and the option are confirm now and confirm later..
I don't have an "back" option..
So now I can't confirm it because i have not an id with my nickname on it.
How do i update my name?

Kind regards,

Mario O.