Step 6: Wiring the panels to the battery.
Solder another pair of wires to the positive and negative terminals of the battery; you will have to cut away some of the tape. After you are done soldering, put some tape back so it won't short out against the back shielding of the device.
Put some tape beneath where you want to put your IC so that it doesn't short out against the EM shielding.
Now you can solder the wires from the battery and the solar panels to the IC. Follow the nice schematic attached to this step: the negative terminals of both the battery and the solar panels are wired to pin 2 (GND), the positive terminal of the solar panels is wired to pin 1 (USB) and the positive terminal of the battery is wired to pin 5 (BAT).
Place the board somewhere where it's not in the way of anything when you put the e-reader back together and put some more tape over it to fix it in place.