Remove the top cover by lifting it.
Locate the miniPCIe slot on the PCB and remove two factory attached screws.
Attach provided a thick thermal pad to the card, and install the card into miniPCIe slot so that the thermal pad is between PCB and card.
The secure card in place using previously removed two screws.
Attach the grey uFL connector to the MAIN antenna connector of the modem, attach the black cable to the secondary (or AUX) connector.
Attach a thinner thermal pad to the top of the card.
Drill a hole for cables using a 6.5 mm drill to provide an opening for card antenna cables.
Guide through the card cables.
Reassemble.