Unscrew the casing for the powerjack and slide it onto the double wire, if you're using heatshrink tubing it might be prudent to shrink it before this.



The adapter I used uses the sleeve as ground/negative and the tip/hole as positive, so you will have to solder the female connector in accordance to that.



I soldered the black wire to the longer connector that connects to the wall of the connector. The positive pin in the middle of the female connector leads to a small hole on the back of the connector. I pushed my red wire in there and filled the hole with solder, making sure the solder held the wire in place. (This might not be correct procedure for how this is done, doing this was my first time and it worked for me. The only problem I had was the heat from the solder caused the pin to shift a bit in the connector, but I had no problems with it)



Slide the casing of the connector back up and screw it in place.



Tape up the connections on the LED-strip



You're done!



Test the LED-strip by connecting the adapter, the LED-strip to the adapter and finally flipping the switch on the cable.



I mounted mine with tape underneath the cupboard. I didn't have suitable screws or wire fasteners at home.



The LED-strip has four connectors in total, two pairs at each end, one marked with a + and one with -. Solder the double-wire LED-strip connector to one pair of these contacts. Standards tell that the red wire should be plus/positive and the black negative, but that is up to you, adhering to the red/black for plus/minus helps in making sure you don't make wrong connections.I added some heatshrink tubing to the double-wire to tidy it up a bit, though it's not strictly necessary.