There are a couple options. My favorite is to place the bag with frozen shrimp in the fridge at least 24 hours ahead of time in the fridge and let it thaw. If you need it faster, you can fill your sink with hot tap water and place the unopened bag in it for 30 minutes, squeezing it a couple times to help separate the shrimp. Or, open the bag, place frozen shrimp in a colander and run cold water over it moving the shrimp around until thawed.