Solder the wires to poles on the jack as outlined in the steps below. Poles are shown in the first picture segmented by the color boxes. For proper soldering technique please use: iFixit Soldering Guide

The first pole (Marked with the red box) is grounded. Solder on the green-gold, red-gold, and red-green wires. The third picture refers to this step.

The second pole (Marked with the orange box) is for the right earbud. Solder on the red wire.

The third pole (Marked with the yellow box) is for the left earbud. Solder on the green wire.

Finally, the fourth pole (Marked with the green box) that is not connected to the rest is for the mic. Solder on the gold wire.