Cut the lobster tails on the rounded side down to the fan of the tail. Carefully, pop meat out of the tail. Rinse under cold water to remove any grit or shell. Repeat until all the lobster tails have been cut. Using a steamer basket or trivet place in the Instant Pot. Place the tails on top, then pour in 1 cup of water.
Close lid and place steam valve to "sealed". Cook on "steam" for 2 minutes. *See notes on cooking frozen below. It will take 2-3 minutes to come to pressure then 2 minutes to cook.
Once the tails are done cooking and the timer beeps, carefully force pressure from the valve *this will take about 1 minutes. Carefully, unlock the lid and remove the lobster tails. Brush each piece of meat with a little bit of melted butter. Serve with lemon wedges and melted butter. Enjoy immediately.