Hold the Wi-Fi card by its edges. Don't touch the gold contacts with your fingers. If you do, wipe the contacts with a clean, lint-free cloth to remove any finger oils.

Align the Wi-Fi card's gold contacts and notch with the socket on the Mainboard.

Insert the Wi-Fi card into the socket at a shallow angle. The gold contacts should mostly be covered by the socket.

The Wi-Fi card fits into the socket in one orientation. If it doesn't fit, try flipping the module.