To create a new page click on Pages button in middle left of your screen.
Then click on Add New button on top
It will open up the options for Page, Popup, Folder etc. and click on Page
That will open up a window with the different designs available as a template for your new page. Everything is categorized into categories and you can preview each page design.
You can also click on Empty Page to start from scratch or Existing Page to select a page from your current website or template as a reference.
After selecting a template all you need to do is add Name, URL for the page and select a Group (folder) that is used for better organization of your pages and click Add to finish.