Step 5: Connect the last two wires
You will need another piece of two conductor wire, about 6 inches or so. This will need to be spliced to the existing white and shielded wires. If your zip cord is color coded, use the red strip (or whatever color you used before) to connect to the white wire. Solder these together and wrap it with a layer or two of electrical tape.
Repeat this with the other wire, again wrapping the connection with electrical tape.
Now, connect the free end of the zip cord to the jack. The black wire connects to ground (along with the ground wire from the previous step) and connect the striped wire (positive) to the remaining terminal on the jack - the one that connects to the tip contact.