In the Page Editor session, while editing a page, you will be able to choose the Pop-up Modal widget. This widget can be added on any page that is configured to be edited through the Page Editor tab.
There's no need to consider the order of this plugin in the page editing tab, as it will be rendered by overlaying the page content in transparency format.
While editing the widget, you can make some customizations such as changing your title and adding content, from simple texts to images and editing HTML content. Press Save Changes and then save the page.
When a page that contains a pop-up widget is accessed by a user, the widget will appear on the screen just after the page is loaded. If the page is closed, the system will no longer show the same pop-up for the same user, to avoid wear during navigation.