1. Click on the name of the theme you wish to edit.
2. Set menu spacing. The default option makes the menu items span the full width of your menu area. If you want them to be left aligned, choose the left align option.
3. Chose a color palette for your site. These are some pre-defined color schemes that will help you pick a color that you like. For more fine grained control, knowledge of CSS is probably a good thing, and you can apply your own styles using the CSS injector.
4. Click "Save Configuration".