How to set exposure settings such as aperture, shutter speed and EV?

Whether or not the settings of aperture(f), shutter speed(s) and exposure value(EV) can be set depends on the shooting mode. A red icon for either one of the settings means that you could adjust the corresponding setting with the control dial. A white icon means that you can tap on it to enable it and once the icon turns red, you can adjust the setting with control dial. A greyed out icon means you cannot adjust the setting at this moment.