You can change your in-app name for one time.
On the main screen, you can click/tap on the human icon at the bottom right hand side of the screen tabbar. Then you can click/tap on “Settings” to update your profile information.
On the right hand side of your Username, you can click/tap on “Edit”, a window will open at the bottom of the screen. You can type in your new username then click “Submit”. The new username will be updated in your profile settings.