...
Activating Refined as the Global theme changes the look and feel of your Confluence instance. If you want It’s also possible to keep the native Confluence look and feel and only apply Refined to specific spaces, click here.
Go to General Configuration.
In the left-hand menu, look for Refined and click Configuration.
Click Activate Refined as the Global Theme.
...
Go to the Refined Administration.
Go to the Site Builder tab.
Click the Add site button.
Learn how to work with the Site Builder.
Create and apply themes
A theme determines the look of your site. In the Refined Administration’s Themes tab, choose a pre-set theme, or apply your corporate branding by building your own custom theme.
Add content to the global site home
The global site home is the start site and first point of entry for Confluence users (unless you specify otherwise).
Add content to your global site home.
Customise spaces and space layouts
A Space Layout determines the look and feel of the pages within a space. By setting up different Space Layouts, you can adapt spaces to different users.
Additionally, make sure to add your spaces to categories.
Customise your site's footer
Add links, news, a logo, HTML modules and more to your footer. Read more.