First, you must register for the app with the email you have provided, your Facebook account, or the number you have on your phone. The TikTok app will automatically assign users a unique user name for those who sign-up using the phone number you have entered. To change the name of your TikTok username, tap the icon in the lower right-hand corner, which is shaped like the upper portion of a human. Select "Edit Your Profile." It's where you can change your username to one similar to the ones we've listed. You can also include your bio, a picture, and a video profile.