This template has the menu in left sidebar. The menu is using the Simple Navigation menu template. It is styled in the stylesheet called Navigation Simple - Vertical.
You can easily float the sidebar with the menu to the right instead. Look in the Layout Left sidebar + 1 column style sheet for the
float:left; property in the
div#sidebar element. Change that to
float:right; and the sidebar with the menu will instead be on the right side of the content, of course you will also have to adjust the margins for the sidebar and the div#main, basically just swap the left and right margins.