Hold the SSD 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 SSD's gold contacts with its socket.

Insert the SSD into the socket at a shallow angle. The gold contacts should mostly be covered by the socket.

The SSD fits into the socket in one orientation. If it doesn't feel like it fits, try flipping the module.