Time of Popup

I have set the plugin in a manner that the popup is shown only on posts and pages.The popup appears everytime the visitor lands on a new post . I would like to know how can I configure the plugin, so that the pop up does not apper again if the visitor has closed it, until the page is refreshed.

For instance, if visitor saw the popup on post A, and closed it. Then proceeded to post B, I don’t want the popup to appear again as the visitor already closed it in post A.

Thanks.