Once a trigger is triggered, it will process a script and the script designates which action is executed.
To get started, click on the New Script (file with a plus sign) button to name your script.
Your list of scripts will be stored on the left-hand toolbar. To delete any scripts you've created, you can click on the Delete (trash icon) button after clicking on the pencil icon next to the script name.
When you've completed your script, click on the Save button in the top-right corner of the screen.