The iTek Page Showcase widget relies on there being actual pages published and each page to be used has a featured image set on it.
You have three locations for the showcase and each location should only contain one widget. Be sure to select the page you want to showcase, check boxes for “Display Page Thumbnail?” & “Display The Page Title?” plus any other options as needed.
Let me know if that helps at all or if you are still have problems getting it to work.
Regards,
Zulf