Using this adapter is super easy. First, connect the bare wires to the screw terminals on one end. Make sure the connections are tight to avoid any loose wires. Then, plug the 5.5x2.1mm male barrel jack on the other end into the appropriate socket on your Arduino or development board. When handling the adapter, be careful not to bend the barrel jack too much as it might break. Also, ensure that the center - positive polarity is correct for your device. To keep it in good condition, store it in a dry place when not in use. Wipe it with a clean, dry cloth if it gets dirty.