This is the text box. When logged in as an admin, select the Portfolio Items in the menu to view the items or add new ones.  Then assign the category on the right side to determine what page it will display on.

While creating or editing an item you can also add a featured image at the bottom right of the screen which I set to also display at the top of the individual project page.  You can also place images into the text box editor. The featured image will always be the preview for the specific industry pages that show all the projects with an image and title.

Or a Link.