Moving Sidebars

I combed through the forum histories about how to move a sidebar to the other side of the page but the answers didn’t help. The url is http://www.filsonassociates.com and I’m trying to keep the theme I have becasue the search to find it took a long time and it’s over all perfect for what I need. I’ve checked the CSS code and found what I thought would move it (changing right to left where found) but without success. The theme is Holidaez and the header banner is what I want to keep. I’m open to suggestions. Thank you.