– Clean the crab and make sure it's clear of impurities. I listed how to clean it thoroughly above, but you can just wash the crabs with water to remove sand and seaweeds. Then go to the next step. – Place the inner pot in the Instant Pot base. Add in two cups of water. – Arrange the crabs in the inner pot make sure that the crabs are crisscrossed to each other. – Cover with pressure cooker lid and push the pressure cooker button. Set the pressure on HI and set the timer to 8 minutes.Quick Release when done.