Step 4: Bringing power to the chip
First hook up 3 wires as shown in the photo. One is going to be ground/negative (the black wire shown), and 2 will be to the positive.
If you can't tell which pins are being connected on the chip, look at the 5th image in this step which is a pin mapping that I pulled from Arduino's website to reference. Going by that, you can see that our ground/negative (black) wire is going to pin 22, and the 2 positives (the red wires) are going to pins 20 and 21.
Next hook up 1 more positive (red) wire and 1 more negative (black) wire as shown in the 3rd/4th photos (they're the same thing...just one is zoomed in more).
Again, if you can't tell, look at the Arduino mapping, and you can see that we're connecting our ground/negative (black) wire to pin 8, and the positive (red) wire to pin 7.