Customizing the SPUN Theme

So, a few things here. I need to be able to reverse the flow of the front page of the SPUN theme (it currently runs right to left, which I find counter-intuitive) and I need the oldest posts at the top left and new ones placed next to it, flowing to the right and down (currently, the newest bump the old ones to the right, then down to the lower rows before starting a new page to the left.) Basically I need to reverse how all of this works. Please help if you can.

Oh and for reference, here’s an example of how the theme works currently: http://spun-demo.calobeedoodles.com/

Thanks!