To turn the power on, hold down on the grey circle button above the touchscreen for a few seconds. You should see the touchscreen turn on. If the bottle's power has died, make sure you have it docked on the power station before turning back on.
To turn the power off, click the power button (the center grape) on the home screen, then select turn power off, then select confirm. Or hold down on the grey button above the touch screen until the power off prompt appears. Your Kuvée bottle will now power off.