How to change user name?

well, if you want to change what name you are using on your avitar, you could go to your profile, and edit it. If you are trying to change a user name, that you set up for something like your email, with a password, you cannot. You will have to set up a new email account, to the new one you want, and then you can add in all of your email addresses to the new account, or just email everyone from the old account, of your new email addy. Unless you want to contact Yahoo, they may be able to change your user name, but I doubt it.How to change user name?
no need to change , just register a new one , old one will automatically be removed

i did the same

good luck