Facebook app has been designed in a way that you cannot change your name directly from it. However, you can still change your name by following a few steps. To change your name on Facebook app, you will need to access your account from a web browser. Once you have accessed your account, you can then navigate to the "About" section and click on the "Edit" button next to your name. From here, you can update your name and click on the "Review Change" button to submit your request. Facebook will then verify your name change and if it meets their guidelines, your name will be updated.