In step [1], unplug the jacks by using the removal tool antenna RF connector (P/N: 08K7159) or pick the connectors with your fingers and gently unplug them in direction of the arrow.
Please perform the following step as shown in the picture below.
PCI Express Mini Card for wireless LAN installation
When installing: Plug the gray cable into the jack labeled MAIN, and the black cable into the jack labeled AUX on the card.