First, peel the potatoes, and cut into large cubes (make sure all pieces are similar in size). Place in the Instant Pot and cover with about 4 cups of water. Add one teaspoon of salt to the water. Close the lid, making sure the valve is in "sealing" position. Select the "steam" setting and cook for 12 minutes. As soon as the Instant Pot beeps and the potatoes are done; carefully do a quick pressure release. Drain the potatoes immediately into a strainer.