There is no on/off or "power" button on your Bonaverde Berlin. You simply plug it in and you are ready to go.
If in doubt, or you're lonely, 'wake up' the machine by touching the sensor pad on the front of the machine to get a response.
After you make a pot of coffee the machine will keep the pot warm for 15-30 minutes (depending on roast recipe) and then turn off automatically. Your machine will then go into standby mode until you are ready to make your next pot.