How to change your POKEMON GO nickname.

So you don't like your current name as trainer of pokemon and want to change your Pokemon GO name. Luckily Niantic's now allow you to change it once, so make sure you type your desired nickname.
Here's how:

1. Tap(click) the POKEMON ball at the button of your app.
2. Tap SETTINGS at the top right side of your screen.
3. then scroll down and tap Change NickName and tap YES
4. type your desired name and tap OK
5. then tap YES two times.

That's it! After you change your NickName you will not see the change nickname button again.