Soak the chickpeas in water overnight or for 4 hours. Add the chickpeas along with the water to the instant pot insert. Close the lid with vent in sealing position.  Set the Instant Pot to High Pressure, and adjust the timer to 20 minutes. Choose 40 minutes cooking time if using un-soaked chickpeas. When the cooking time is up, turn off the Instant Pot and do Natural pressure release. Strain the liquid and use cooked chickpeas as needed.