Unsolder the two wires at the given points. If you need help soldering, see this guide.

The speaker has two colored wires attached to the orange plate: one attached to the positive (+) end, and the other attached to the negative (-) end.

The left speaker (shown) has a yellow wire on the positive (+) end, and an orange wire on the negative (-) end.

The right speaker (not shown) has a brown wire on the positive (+) end, and a red wire on the negative (-) end.