Because your username is the handle people use to communicate with you on Twitter, it's important to pick a good one. You can change your Twitter username via your account's Settings panel. Twitter permits usernames up to 15 characters in length. Permitted characters includes letters, numbers and the underscore only. You can't use dashes, symbols or spaces.
Changing Your Username
Click your profile picture located along the top of the screen and select Settings on the drop-down menu.
Click the Username field, erase your current username and enter a new one. If the username you enter is already in use by someone else, a message saying “Username has already been taken” appears over the Username field. You may have to enter several potential names until you find one that is not already taken.
Click the Save Changes button to save your new username.
Changing Your Display Name
Your display name is different from your username. Sometimes referred to as your "real name," it shows up on your profile page and in the Twitter feeds of other Twitter users. It's the first name people see when reading your tweets. If you use Twitter for a business or group, this will likely be your business or group name.
Click your profile picture and select View Profile to open your Twitter profile page.
Press the Edit Profile button to make your profile editable.
Erase you current display name and input a new one in the Name field.
Click the Save Changes button to save your new display name.
Additional Guidelines and Restrictions
- Usernames can't contain the words "Admin" or "Twitter."
- You also can't select a username that has recently been scheduled for deletion. Recently deleted usernames may also remain unavailable until they have been completely purged from Twitter's network.
- Usernames are not case sensitive. One user could not be named "Bob" and another "bob," for instance.