Name Change
It’s not a feature offered at this time.
You can find a thread about it over in GD.
Good luck.
It has been brought up many times. Here is a post from Gaile Gray on the issue and why they do not currently offer this option:
Im just thinking that they could give an option to change it just once
Im just thinking that they could give an option to change it just once
More about Display Name Changes
If we allow changes of display names, a person who has been harassing another player will be hidden from that victim’s sight. A person who has built up a reputation for cheating, or botting, or doing other breaches of the UA, becomes invisible to those players who were aware of the issue and were awaiting action on the matter. Several other factors of “individual accountability” can be negated by simply hiding behind a new display name.
That comment alone explains why they don’t, and most likely never will.