Action Library - this floating panel is a searchable repository of available Actions which can be dragged into your workflow. If you don't see the Action Library panel, select the Window→Action Library (⌥⌘L) main menu item. To add an Action to a Workflow, click and drag one of the Actions in the Action Library to your Workflow. Or, double-clicking an Action in the Action Library will also append it to the end of your frontmost Workflow.