New pages are created by adding code like:

 [[freesco:section:subsection:pagename]]

(where the 'section' part is one of the main chapters out of the section list) as a link in your article. The link will show in red because the page isn't created yet. Clicking the red link will result in a 'Page not found' message, where you can then edit the new contents. Make sure to start freesco specific stuff with the freesco: tag!

Please give it a try on the playground first before making changes here if you're new to this. Looking at existing pages how it's done, is probably also a good idea