Make sure the power supply is placed at least 12 feet from the edge of the pool. Connect the floating cable to the power supply, align the lug on the connector with the notch of the plug on the power supply, then turn clockwise. Press the ON/OFF button on the power supply to begin cleaning. The power supply for your Dolphin is not waterproof- it is water resistant. When in use, make sure it was either stored on the caddy or far away from the pool, so it does not get pulled in. Always use an electrical outlet protected with a Ground Fault Interrupter (GFI) device; this will protect your Dolphin from surges in power. Do not use an extension cord or surge protector to power your Dolphin.