Adding a new page
Adding a new page is very easy. In the dropdown menu look for "Add new page", click on it an proceed from there.
In addition, you can keep a newly created page is draft mode for as long as necessary to make changes. When you are ready to publish the page, remember to change the Moderation State (at the bottom of the page under "Publishing options") from "Current: Draft" to "Published"
Keep in mind that the new page will not appear in your navigation until you add it there.