Add meatballs into the water and close the lid of the pot. If you are using a regular pressure cooker, you will need to time it yourself. Ideally, timing should start from the time the lid is sealed and the hear a slight hiss incoming from the lid. You will also notice that the pressure button will come up. The beauty of Instant Pot is that it will do the job for you. It will only count time once the pressure is built and the lid is sealed. You can press the soup setting on the Instant Pot and modify the time. However, I like using the MANUAL setting for this soup. I press the MANUAL on the dashboard, select LOW pressure and set the time to 12 minutes. Once the time is up, let the steam out of the pot. Check the soup for the taste. Add salt if it needs any and your soup is ready to serve! Garnish with the herbs of your choice and voila!