Refrigerator thawing. Place your ribs in a sealed container or bag in the fridge on a plate, and allow several hours to days for complete thawing, depending on size. 

Cold Water thawing. Seal the ribs in a leak-proof bag, submerge them in cold water, refresh the water every 30 minutes, and expect a few hours for thawing, depending on rib size.

Microwave thawing. Use the microwave's defrost setting for the ribs, following its meat defrosting guidelines, and check every few minutes to prevent cooking.