You can change modes by pressing the icons on the [Home] screen lightly.
Do not apply strong impact or force to the screen. Or it may be damaged. Maximum force allowable is approx. 30N (approx. 3 kgf). (N = Newton, kgf = Kilogram force. 1 kgf = 9.8N.)
For details about how to read the [Home] screen, see How to Use the [Home] Screen.
For details about how to read the screen of each function, see How to Use the Screens on the Control Panel.