When you have existing content in your Wordpress installation, activating your theme will most likely make your site look a little weird. The reason for that are Widgets that are assigned to default positions that don't fit with the theme. We can improve that by assigning them to better positions available in our theme.
The blue widget positions allow to choose a widget layout which defines the widget alignment and proportions: parallel, stacked, first doubled, last doubled and center doubled. You can easily add your own widget layouts.
The two available sidebars, highlighted in red, can be switched to the left or right side and their widths can easily be set in the theme administration.