There are several ways to start a new page. These can vary based on the type of page started, as well as the wiki and namespace.
Clicking a red link will take you to the edit page for the new article. Simply type your text, click save and the new page will be created.
Once the page has been created, the link will change from red to blue (purple for pages you've visited) indicating that the article now exists.
Usually this is the best way to create a new page, because it means that right from the start, the page will be linked from at least one other place on the wiki (and typically you will want to mesh it into other related pages later). If you are creating a new page without creating any link to it, you may need to ask yourself: Does this page really fit in with the topics already covered in the wiki? Also, how are you expecting visitors to find this page? Normally there is no reason to create a page without first creating a red link to it.
http://www.example.net/wiki/en/ARTICLE
If you replace ARTICLE
with the name of the page you wish to create, you will be taken to a blank page which indicates that no article of that name exists yet. Clicking the "Seite bearbeiten" page tab at the top of the page will take you to the edit page for that article, where you can create the new page by typing your text, and clicking submit.
Don't forget to setup redirects when you create a page. If you think another person may search for the page you've created by using a different name or spelling, please create the proper redirect(s). See Links.