On-click targeting option allows you to display your popup when a visitor clicks on a button. What button? That one there, click on it.
You can add a popup that will show up when clicked on a button, image, etc.
Go to the "Visitor Behavior" section on the 3rd step of the Popupsmart popup builder. Then select "On Click".
Follow the instructions and your popup will show up when a visitor clicks on the button or image that you added your popup.