To make a foil sling for the cheesecake, tear off a large piece of foil - about 24 inches long. Fold it in half again, and again until you end up with a long piece of thick foil, about 2 or 3 inches wide. Place the foil under the pan, before you place the pan on the trivet in the Instant Pot. Make sure to keep the foil away from the cheesecake batter. You can fold it down so it stays put during cooking, away from the batter. Unfold the strip or sling of foil, and use it to lift the cheesecake from the Instant Pot.