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Once you create a YouTube username, you will not be able to change it. However, if you were affected by the Google+ to YouTube name change, you should be able to edit your preferences for the name displayed in your account settings.
Here are the steps involved in deleting your YouTube account:Sign on to your YouTube account and then click on your username;Click on Account and look to your left; the bottom choice will say "Manage account";Click on "Close account" and give the reason why you want to delete it, and Voila, you're done.
You cant change it, if you really want to change it the only way to do it is to delete your account and to do that you have to go to manage account, delete account, give a reason, and boom you have deleted your youtube account.
In Avatar: Legends of the arena you just need to click on your name to change it. I am not sure about THAT OTHER webgame sorry.
Ariana Grande's youtube username is "osnapitzari". She also own the account "WeAreStoopKid" along with Liz Gillies and Matt Bennet. This is her only accounts, any other claiming to be her is fake.