Make sure your machine is unplugged and disconnected from the mains / wall-socket.
Open your meCoffee and place the enclosed sensor at a safe position.
Fetch the green and red wires from the set : these have a single female on one end, and a female+male on the other.
Locate the power button of your machine ( for V4/E aka V5 click here ).
Connect the female+male side of the green wire to the existing (black)neutral-wire of the power button and insert it at the original terminal of the neutral wire. Connect the female side of this green wire to terminal #1 (neutral) of the meCoffee.
Connect the female+male side of the red wire to the existing (red)live-wire and insert it at the original terminal of the red wire. Connect the female side of this red wire to terminal #3 (live) of the meCoffee.
Now be careful to place the meCoffee as well as the sensor in a stable position, isolated from any conductive materials. Turn your machine on.
Switch to the Bluetooth-settings of your device. Pair with ‘meCoffee’ using PIN 4321. Open the meBarista App and select Scan or Connect.