For more information on the similarities and differences between WP Fusion and AutomatorWP, check out WP Fusion vs AutomatorWP.
Note: To use WP Fusion with AutomatorWP, you must install the AutomatorWP – WP Fusion addon.
Create a new recipe and choose WP Fusion as the trigger. The available options are Tag Applied and Tag Removed. For each you can select a single tag from the dropdown.
Then, connect your trigger to one or more actions. When the selected tag is applied (or removed), the connected actions will be triggered.
WP Fusion can also be used as an action connected to another trigger. The available actions are Apply tag, Remove tag, and Track Event (via the Event Tracking addon).