Combine the Rub ingredients in a small dish. Rub on the front and back of the ribs.
Pour Rib Pot ingredients in the bottom of the pot and then place the trivet in the pot.
Place the ribs inside the pot, standing on their side, wrapping around the inside of the pot.
Using the display panel select the MANUAL function*. Use the +/- keys and program the Instant Pot for 25 minutes.
When the time is up, let the pressure naturally release for 10 minutes, then quick-release the remaining pressure.
Carefully remove the ribs from the pressure cooker and set on a foil lined baking sheet. Brush with BBQ sauce and set under the broiler until sauce begins to caramelize, about 5 minutes.
While the ribs are under the broiler, clean the Instant Pot and refill with 1 cup of water, the trivet and the corn. Do not overfill the pot.
Using the display panel select the MANUAL function*. Use the +/- keys and program the Instant Pot for 3 minutes.
When the time is up, quick-release the pressure.
Notes
*The MANUAL and PRESSURE COOK buttons are interchangeable.