Here’s what I learned from the theme author:
> It can be changed in: templates/template.search.php
>
> line: 18
>
> Change array(‘post’, ‘portfolio-item’, ‘slider-item’, ‘news-item’) to
> array(‘post’, ‘page’, ‘portfolio-item’, ‘slider-item’, ‘news-item’)
>
Apparently it requires editerplus or some other software to modify the theme php. I am still working out how to do that, but may need to enlist the help of a more experienced web developer.
