And change your username even if it's just temp for the now....It worked after a while for me. Save down the bottom of the page It may or may not show up straight away but good luck.
It showed up with my new name I created when i opened up forum on my tablet. But....my old user name with the .email still exists on old posts I had made.
It evidently just takes a little while for the change to go through, new username is now active, but as said above it doesn't update your previous posts with the new name.