Place the dry garbanzo beans, 1 tablespoon of salt and 4 cups of water in a large bowl. Soak overnight or at least 8 hours. Rinse with water and drain. Pour the garbanzo beans into the Instant Pot. Add 6 cups of water and 1 tablespoon of salt. Close the lid and turn the steam release handle to the SEALING Position. Select PRESSURE COOK and adjust the time to 10 minutes of cooking time. Pressure Cook the beans. When it is done, wait another 10 minutes before venting. Using a large spoon turn the steam release handle to the VENTING Position. Once it is done venting, open the lid and carefully drain the water. Use the cooked beans or store for later.