Place water in the bottom of your Instant Pot. Add the trivet, then place your crab legs on top. Seal the lid shut and make sure that the vent is set to "sealing".

Cook crab legs on high pressure. 4 minutes for king crab legs, 2 minutes for snow crab.

Once cooking is complete, perform a quick release. Once the pressure has been released, open the Instant Pot and remove the crab legs.

Melt the butter on the stovetop or in the microwave. Add a squeeze of lemon, if desired.

Serve crab legs with the butter dipping sauce and enjoy!