The language belongs to your account, not to the computer. Your choice follows you to any terminal you sign in to. It does not change anyone else's screen.
Steps
- On the home screen, tap Settings. In Spanish it is called Ajustes.
- Tap the Language tab. In Spanish it is called Idioma.
- Open the list and choose English (US) or Español (México).
- Tap Save Language. In Spanish it is called Guardar idioma.
- The whole app changes language right away. You do not need to restart.