Place the right speaker console face up with the four speaker terminals situated above the 16 Ohm speaker as pictured.

Make sure the red wire is connected to the far right terminal and the green wire is connected to the far left terminal; if this is not the case solder your wires into place. Here is iFixit's soldering guide

If you had to solder or reconnect any wires, test your headset before moving on to the next step.