On the Change Username page, click the "Username" text box and type the new username you'd like to use (it should be less than 15 characters). While you're typing, Twitter will tell you if the ...

If you thought you were stuck with the embarrassing Twitter name from eighth grade, you were wrong. Here's how to change your Twitter username and display name.

Select Username, and you’re allowed to update your username on this screen. Note: As you tap the New Username field, a Twitter prompt pops up asking if you’re sure about the change, click ...