To create a new page for your site, go to the administrative menu at the top and select Content. Go to Add Content and then Inner Page.
WARNING! If your site is large enough to have multiple layers, you should use review the section about telling a page where in your site it should be published.
Now you can build a new page using the same methods as updating an existing page. Remember to add a title. The title will become the name of your page as well as the name of the link in your navigation.
Once you are done adding content to the page, you need to publish it.
WARNING! If your site is large enought to have your content on different layers, then you should review the Advanced section before you publish your page.