In the Instant Pot, combine rice, 2 cups of water, salt, and half the butter.Stir and spread the rice into an even layer.
Cook rice
Close the lid of the Instant Pot and set the valve to SEALING. Cook on HIGH PRESSURE for one minute.When the timer stops, leave it undisturbed with the valve still on SEALING until the pot has released all the pressure (around 15 minutes).
Fluff rice
Open the lid and add the remaining butter, mix it in, and fluff the rice with a fork. Serve.