To pressure cook the potatoes, place them in salted water to cover (about ½ cup kosher salt). Set the Instant Pot for 3 minutes on Manual pressure. When the Instant pot finishes the 3 minutes, allow the pressure to come down naturally for 10 minutes, then release manually the rest of the way. Allow the potatoes to set in the salt water for at least another 5 minutes before removing them to a colander. Don't rinse off the salt, just let the potatoes cool until you can chop them without burning yourself.