Hover above Home in the left corner of the Top Toolbar and click the Add a New Page

You’ll see a gallery with different page templates.
Here you can copy an existing page, add blank pages or select one from the available designs.

Click the page design of your choice and name it.

Select Add Page.

Next, you’ll be asked if you wish to add it to your site’s main menu. Choose the option you prefer.

Welcome to your new page: let the editing begin!