Select Software Integration in the left list.
Go to the Stan tab.
Toggle the Show Stan functionality in Pirana box to switch between showing and hiding Stan functionality in Pirana’s UI.
Enter the Stan model file extension to use for model files in the field.
Use the Defaults button to delete all changes to values and reload the default settings.
When finished, press the Save and close button
The settings are saved and you will be returned to the main Pirana window.