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Creating new pages
Enter your new page title in the "search" bar on the left, press the "Go" button
This results in a failed search page, but note the first sentence that says:
No page with this exact title exists, trying full search
The phrase "this exact title" is a URL link which will take you into the editor for this new page. Add content there, save and you have created the new page.
Creating URL Links from your pages
For internal links to pages within this Wiki: In your page text, enclose the title of the page you want to link to in double square brackets: [[Main Page]] which appears as Main Page.
For external links, place the http:// URL in your page with the title following, highlight the whole thing, and then press the fourth button from the left at the top of the editor bar, looks like a little world image ...