Set your ham in the middle of a large sheet of heavy-duty foil.
Wrap foil around ham and secure tightly
Pour in 1 cup of water
Place trivet inside of Instant Pot
Place ham (wrapped in foil) on top of the trivet.
Secure the Instant Pot lid and set the knob to the sealing position.
Cook on Manual/High pressure 15-25 minutes depending on the weight of your ham.
Let the Instant Pot naturally release for about 10, then perform a quick release.