It is really simple. There is a direct approach. Look at the page url. Change the part after the last / to a new page name. Et voilĂ ! The edit box opens.
Normally pages are created just by linking to them. This is easy because of those funny CamelCaseWords. The wiki automagically recognizes such words and puts a link in the final page. If the page exists you can follow the link. If not an edit box opens.
Instead of CamelCase you can put double square brackets around the page name. Like this: [[New Page]]. Pleas do not edit [[New_Page?]] to keep this example working.