Wash and then pierce potatoes with a fork all the way around each potato. Rub salt on the outside of the skins
Put a trivet inside your pressure cooker with 1.5 c. water, make sure water doesn't touch trivet itself (don't want potatoes touching water)
Place 4-5 potatoes inside your pressure cooker, they can be stacked but try to keep in a single layer as much as possible.
Close lid and steam valve and set to high pressure for 15 minutes. (note, time will vary according to how large your potatoes are but I have found 15 minutes gets the middle done and insides tender).
When done allow to naturally release pressure for 10 minutes, release rest of pressure. Use a fork to pierce to ensure middle of potato is done. If not, put back and set for additional 5 minutes if needed. Enjoy!