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Pour 1 cup of water into a 6-quart Instant Pot. Add potatoes and salt.
Secure lid and turn valve to seal.
Cook on "Pressure Cook" (or "Manual") high pressure for 10 minutes. When the timer goes off, turn valve to vent, to quick release pressure. When depressurized, carefully remove cover.
Drain potatoes, using a colander in the sink. Return potatoes to Instant Pot.
Add milk, butter, and pepper to potatoes. Mash thoroughly with a potato masher. Add more milk as needed to achieve desired consistency.