To change your username, email, or password, log in and go to your Settings page. You can get to this page at any time from the drop-down under your profile picture.
You can change your username one time only. Just scroll to the "Change your username" section, and enter your password. You will then be able to pick a new username.
If you log in to Quizlet with Facebook, you'll be asked to verify your Facebook account before you can change your username.
All of your account data will be seamlessly available under your new username. Also, your old name will always refer to your account. You'll be able to log in with either your old or new name. This means that nobody will be able to impersonate you by taking your previous name. quizlet.com/jalenack and quizlet.com/asuth are the same user.
Email address and Password
On the Settings page, you can change your email or password: