You don't It is the black and brown on the 230v section towards the bottom. You should have a timer though which comes off that to the timer and then from the timer to the stat?
You need an electrician.
I have mine delivered today. Already started planning and took pictures of my current cabling. This is my boiler - Vaillant turbomax 824E (pic1) This in the controller on the wall (pic2) Thing I am not clear about is do I need any additional wires? How do I connect wires from the boiler to heat link pic1? Which wires in the current controller (pic1) control the current thermostat pic2?
Might be worth posting that as a separate discussion in discussion area. Explain how it works including any personal experience. Never come across it before and it might interest some people
You just claim your monthly bonus every month and get your £15 back...therefore membership is free.