Razer Atrox Xbox One with Brook UFB - Help for connecting the home button

I bought a brook universal fighting board to use my razer atrox XB1 on several consoles.
I have the brook fighting cable to connect buttons and joystick to the brook interface.
But i don’t see how to connect the home/menu button to the brook card.
I don’t know on wich pin i must connect the home/XB key wire from the brook fighting cable…

Some help would be greatly appreciated
Thanks in advance