Answer

Actually using the Smart pop-up is very easy, all you need to do is to place (drag/drop) the content inside its container (which is already placed on the page, when you drag the widget to the page) and preview the page to see the result.
In case you wanted to have a new container or use the Remote Triggering, then you can use Graphic Style to assign a new container. Click Here to see how you can assign a Graphic Style to an Object.
If you have the problem with the Graphic Style you assigned, you can Click Here to see the article in which we explained all the possible cases where the Graphic Style could go wrong.