Option No: 01 - Single Element ( Default )
This is by default option. If you want to show popover only one and single element then select this option. For example you are using 100 anchor tags (a) on a page. But you want to show popover only one anchor tag (a). Then choose this option. This option will get information about URL of that particular page where from you want to import content and selector details like id, class, or attribute to access the content on that particular page.
Option No: 02 - Multiple Elements
If you want to show popover on multiple elements then select this option. For example you are using 100 anchor tags (a) on a page. And you want to show popover on all 100 anchor tags (a). Then choose this option. This option will use the (href) attribute value of all 100 anchor tags (a) as URL of those particular pages where from you want to import contents. And also get detail about selector like id, class, attribute to access the content on those particular pages.
Selector To Access The Content
Selector must be the same on all 100 pages where from you are importing content. For example you want to import some text from a particular paragraph (p) and this paragraph (p) has a particular id='myparagraph'. This paragraph must be the part of all 100 pages with same id='myparagraph'. Then this option will work. And selector will be the #myparagraph