Add the salt to the Instant Pot. Stir to distribute the salt evenly in the pot. Add the new potatoes to the Instant Pot and stir the potatoes to coat with the saltwater.
If needed, add just enough additional water to cover the potatoes.
Close lid and turn valve to sealing.
Cook potatoes on manual high pressure for 3 minutes.
Once the Instant Pot beeps, press the "Keep Warm/Cancel" button to allow the pressure in the Instant Pot to naturally decrease for 10 minutes, then turn the valve to release the pressure the rest of the way.