You can also start a new page in any of the following ways:
Create a link to another page. When you're editing an existing page, you can put double square brackets around any phrase, [[like this]], to create a new link. After you save the page, that link is active -- and if it's not linking to an existing page, then it'll lead you to a form to create the new page.
Start from an existing link. As you read through the articles, you'll come across red links, which means those pages haven't been written yet. Clicking on a red link takes you to a page that says "You have followed a link to a page that doesn't exist yet." Just start typing in the edit box, and then click the save button.
Type out the URL. You can also go directly to a new page by changing a URL in the taskbar. Just create an address: http://gerryanderson.wikia.com/wiki/Sample Title. If the article doesn't exist, then you'll get a chance to create a new page with the name "Sample Title".
Decide between a standard page layout or a blank page. The standard layout provides image and video placeholders as well as section headings. The preload contents for the "Standard layout" are stored at MediaWiki:Createpage-with-video on your wiki and can be edited by local admins.
A second way to create a page is by clicking on any red link on your wiki (which can be created by linking to a page that does not exist). You will then be brought into edit mode where you can add your content.