This step covers the Resistor and power part. This is the part that connects to the LEDs and supplies power.
Take a square of PCB and solder a brwn-blk-brwn resistor (100 Ohms) and take the 6 CM wire from the LED line and solder it to one end of the resistor. Now solder the POSITIVE end of the 9 volt battery clip to the other end of the resistor. Now take the NEGATIVE end of the 9 Volt battery clip and the POSITIVE end of the AA clip and solder it together. Take the NEGATIVE end of the AA battery clip and attach a Slide Switch (See image CIMG2470) and take the very short wire on the RIGHT side of the LED line and solder it to the switch too.