For most Ninja Foodi soups, you will want to move the vent to the seal position so that pressure can build inside the machine. You'll likely be using the pressure lid and will want to select pressure cooking as the function. However, many recipes will ask that you select sear to start a soup recipe. Some recipes will also ask that you select broil at the end to finish off the soup! Be sure to check the recipe carefully to make sure you are using the correct functions, lids and vent positions.