Thaw the crab legs in the refrigerator overnight, or place them in a sealed bag and run cold water over them for 30 to 60 minutes
Fill a large pot with 2 to 3 inches of water and bring it to a boil
Place a steamer basket in the pot if available
Add the crab legs to the steamer basket or directly into the pot
Cover the pot with a lid
Steam for 5 to 7 minutes if thawed, or 8 to 10 minutes if frozen
Remove the crab legs carefully with tongs
Serve immediately with melted butter, lemon, or seasoning if desired