[The right thumb to close the right nostril, ring finger to close left nostril, middle and index fingers folded inward and resting on the palm, little finger erect and towards the sky]. (yogicwayoflife.com)
Then keep your attention on the air leaving your nostrils as you exhale. (mindbodygreen.com)
One of my favorite exercises accesses the polarity of our nervous system with left nostril breathing for calming and right nostril breathing for energizing. (kellybroganmd.com)