Hi,

The featured pages widget automatically uses the page featured image, this is why it doesn't have an image upload option.

So If you want to add image, edit the pages. The featured image can be added on the right side of the page edit screen.

Kind regards,
Andrej

Hi,

I am sorry if my answer was not clear enough. Let me try again.

Featured pages widget displays title, the excerpt and the featured image of the page that it is being displayed. 

So in your case, you want to display "Teeth Whitening" page (among others). This means you have to edit the "Teeth Whitening" page - change the feature image of the "Teeth Whitening" page, not the featured image of the page, where the widget is placed.

You will probably also want to display custom excerpt of the "Teeth Whitening" page in the slider. Here is how to do this:

http://orionthemes.com/knowledgebase/how-to-change-the-excerpt-text-on-featured-pages-widget/

Let me know if this helps.

Kind regards,
Andrej