You will be automatically redirected to the “Position” section once you click “Create Popup”. In this section, you can choose the location on the page where you'd like the popup to be displayed.
There are several position options: Popup, Slide-In (left side), Slide-In (right side), Embedded Popup, Top Bar, and Bottom Bar.
Note: when choosing Embedded Popup option, you need to set up the popup position in the Rules&Triggers section.