1) turn the dial so that the exact time NOW is at the little Arrow indicator. If it's 11:00PM now, then turn until 23 is at the Arrow.
2) To set the time when u want it to switch on, push the little black 'keys' down. If you want it to turn on from 15:00 - 20:00 hrs, then push down all the keys in that region...
3) Set the button on the rightside to reveal the "timer/clock" symbol. Plug it into the socket, and switch on the main power source. Done.