Turn left from the place you are standing and go up the stairs, you can find four steps infront of you, turn left and go up the steps, you are facing towards the window right now, turn left and go up the steps, move a bit forward, turn left, you can find four steps infront of you, go up the steps, you are facing towards the wall right now, slightly turn to your left, stand on the sixth step, that would be your end point.