Include one of the available site sets
New in version 13.1
Site sets have been introduced and are the recommended method to include TypoScript. If you do not want to use site sets, you can still use TypoScript includes to include the default TypoScript.
To use the default rendering definitions provided by fluid_styled_content, you should add one of the two site sets provided by this extension to your site configuration or depend on it in your site package's site set.
Add the site set to your site configuration
This is the recommended way to include the "Fluid Styled Content" site set into basic TYPO3 sites without a custom site package. See also site sets.

Add the site set of Fluid Styled Content
When saving, the GUI then automatically updates your site configuration:
Add the site set to your custom site package
If your installation has a custom site package, it is recommended to depend on the "Fluid Styled Content CSS" site set with your site package's site set:
Edit the settings
All settings of this extension are now available in the Settings editor.
Next step
Display the content elements in your site package template.