Image order/arrangement

I’m using the Pytheas Free WordPress theme, which uses the Flexslider. On the actual portfolio item page, where the slider resides, I have no way of rearranging the images – at least, there is no way apparent to me. It just takes all images uploaded to the post and displays them.

Is there any way to make it so I can re-order them as I see fit?

Here’s a link to a page using the slider:
http://stratfordengineers.com/new/portfolio/luxottica-corporate-headquarters/

For example, on that page above, I want the next to last photo FIRST, and the one immediately currently to the left of it to be second. The photo appearing first I want dead last.

This just seems to have chosen the order at random after I uploaded them. I could figure out the way that they are being chosen, and perhaps re-upload them one at a time, but that doesn’t seem too appealing since we have upward of a hundred posts to make, and anywhere from 5 to 10 photos per post. It would take months to get it all uploaded in the correct order, as I am doing this at my job and am only allotted two hours per workday to devote to it.

Any help would be greatly appreciated.

http://ww.wp.xz.cn/plugins/flexslider-hg/