Before desoldering the contacts, take note of which wire goes to which contact on the motherboard.

With a soldering iron, carefully melt the two speaker contacts on the motherboard and use a desoldering wick to absorb the melted solder to prevent possible short circuits.

Take the new speaker and place it in the same location as the old speaker and screw it in place. With a soldering iron, carefully solder the wires back to the motherboard as they were with the old speaker.

It is crucial not to solder these wires together and to keep each wire with its own contact on the motherboard.