To achieve this the gray wire which was disconnected in the previous step needs to be connected to your meCoffee.
Fetch the gray wire from the set : it should have a single female on one end, and a male on the other. Connect the female side of this wire to terminal #5 of your meCoffee.
The red wires previously connected to the other side of the brew-thermostat remains unconnected.
The remaing loose wire from the steam thermostat remains unconnected.
The best way is to find the other end of the red wire mounted to one of the boiler terminals. This wire is connected to your thermocouple mounted above the power button.
Unmount the red wire from the thermocouple and insert the male end of the grey meCoffee wired connected to terminal #5.
You can either take the time and have your machine heat up fully and do a brew. If you want to continue installing right now it is best to turn your machine off again as soon as possible : a non-hot machine is easier to work with.
If you do heat up fully, your boiler light will start to dim and might start to flicker a bit at ~ 10% power