The 8-ohm speaker included with the kit is super large!
Start by cutting two pieces of wire( 3 - 5 inches long).
Strip about 1/4" off each end of both wires.
Insert one wire into the "+" of the speaker (it's kind of hard to see, but has been imprinted on the white part of the back of the speaker). Solder this guy in. Solder the other wire to the "-" side of the speaker.
Now take the first wire and solder it into the pad labeled "+" next to the "spkr" label. Do the same for "-".