Locate the positive and negative terminals of the speaker.

To attach the new speaker you must solder the new wires to the terminals on the motherboard. To do this hold the wire on the old solder, using a small amount of solder melt the solder and wires to the old connection points.

Soldering irons are very hot and can cause serious injury. If you do not know how to use a soldering iron please seek help from someone who is experienced.

For an explanation on soldering refer to iFixit's soldering guide How To Solder and Desolder Connections