Through a simple user interface, you can change the site-wide logo and colors. This guide describes the basic, point-and-click way to customize the site's user interface.
Note: The basic changes you can make here are based on predefined schemes. If you're looking for a way to write your own themes and are ready to edit source code, be sure to read Customizing the UI with the Theme Resource Kit and Advanced Theming Topics.
To make your Clearspace instance a better fit for you, you'll likely want to change the color scheme and the logo that appear across the entire site. As an administrator, you can do this easily without logging into the admin console. Clearspace offers a simple way in the user interface to make basic site-wide customizations.
The UI in the preview is "real," even including a few links that navigate to other parts of the application. You probably want to keep the preview as it is, so try not to click the links.
Also, notice the link, Find out how to create your own theme. If you're not able to get the look you want on this page, you can click the link to reach a page with more advanced options. There, you can get started editing source code to create your own
theme. For more information see Customizing UI with the Theme Resource Kit.