First of all sit in Siddhasana (posture), close the four openings that is ears, eyes, nose and mouth, with thumbs, index fingers, middle fingers and small fingers respectively of both the hands. It means cover the holes of ears with thumbs, eyes with both index fingers, and both nostrils with middle fingers and mouth is pressed with both the small fingers. Then Apana Vayu (air at rectum) is pulled up and united with Prana-Vayu. Thereafter concentrate on the Shat-Chakras. At the same time by the Guru mantra, awaken the snake like Kundalini Shakti. Raise the Kundalini to the Sahasrara Chakra and the sadhaka should feel as empowered and enjoying the company of Lord Shiva. With this mudra, one attains Samadhi very fast and he is liberated from deadlier sins also.