To create a new entry/page/article for the CGEU wiki, all you need to do is either click on a red link (indicating that the article hasn't been created) or direct your web browser to the address where you want the new page.
As an example, let's say that you want to create an article titled "Winning Union Rights". In your browser's address bar, you would need to type in or change the current address to this:
Just type in the title of your new article at the end of the base URL. Once you have done this and pressed enter to go to the URL, the wiki will let you know that you are editing and it will present you with a text box to start creating the article. When you are finished, you should click the "Show preview" button near the bottom of the window to see how the article will look. Once you are satisfied with the article, click "Save page".
Most of the time you can simply type in the text you want to appear in the article — e.g., putting a paragraph break will give you a paragraph break on the article page. But when you need to use additional formatting, you should read through Wikitext Examples and Help Editing at www.wikimedia.org.