Lay the victim with his head slightly downwards. If possible you can put folded cloths under his shoulder to align the victim’s head in proper angle. The head of the victim is so aligned, that chin points straight upward. Then grip victim’s yaw and raise it upward until lower teeth are higher than upper teeth; or place your fingers on both sides of yaw near earlobes and pull upward, maintain yaw position throughout resuscitation period to prevent the tongue from blocking air passing.
Take a deep breath and place your mouth over victim’s mouth. Place your mouth over victim’s mouth airtightly.