Click on your username at the top right of the screen, then choose Personal Details. At the bottom left of the screen you’ll see Advanced Options with Change Username being the only option.
Was an accidental tangle of legs so frustrating for the defender but has to be a pen I think. Attacker was definitely going to get to the ball first in the box and, accidental or not, the little clip tripped him up denying the opportunity
I just tried it on my android phone and that option doesn’t appear, although it does on my iPad. If you have access to a laptop/PC/Mac try it there!
I'm now considering changing my name to "WrongThread" because someone will shout that at me very soon.