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Go the main headlines page by selecting the respective item in the Content menu.
Click the New headline link in the right sidebar.
Fill out the new headline form per your needs.
The Snippet field should contain a summary of the body of the entry. This information is presented on the headline list page and/or on the home page depending on your site design.
The Body field can contain simply text, Textile markup, or HTML. By using HTML, you can create more complex pages, such as embedded videos.