To create a new page, you need to edit an existing page, and on it add a link to the page you want to create.
To link to your new page, you must choose a name for it. The best names describe the page's content well, so that everyone can remember and type the name easily.
The simplest way to create a link is to place double brackets around the link you want to create. For example typing [[my new page]] will create a link to my new page. Go here for more information about making links.
You can see that the link to my new page has a question mark after it. That's because my new page hasn't been written yet. Clicking the link will take you to an edit form where you can write and save the new page.
Another way to create a page: in your browser's address bar (where the page URL is), replace the name of the current page with the name of the page you wish to create, and hit Enter. PulpWiki will then dutifully tell you that the page you entered doesn't exist, and you will be able to click on a link to create it.
The problem with this method is that there are no links to your new page, so you're the only person who knows it is there. It will be an orphan, unread, unlinked, unloved. That's why adding a link to an existing page is a better way to create a page.