There may be a few reasons your dumplings aren't sticking together. 1. Insufficient Moisture: You need to have enough moisture to seal the dumplings properly. Use a small amount of cold water on one side of the wrapper. If you use too much or too little water it will not seal well. 2. Overfilled: Your dumpling may also not seal if they are overfilled. If you overfill the dumplings, it can make it challenging to seal them. Try reducing the amount of filling to ensure there is enough space to seal the edges securely. 3. Dried Out Wrappers: If the dumpling wrappers have dried out, they may not stick together well. Keep the wrappers covered with a damp cloth or plastic wrap while assembling the dumplings to prevent them from drying out. 4. Poor Sealing Technique: Properly sealing dumplings is essential to keep them from opening during cooking. Make sure to apply enough pressure when pressing the edges together and use your fingers to create small pleats along the sealed edge for a secure seal.