How to Add a Page to Site Navigation
To add a page to your main menu, navigate to Site Builder and click Customize.
From there click on the Navigation tab.
Now click on the New Item button.
In the left column, from the Link Type dropdown menu select Page. Proceed by choosing the page you’d like to be added to your menu from the Select Page drop down.
Choose a name for your menu item that will be displayed to visitors.
Make sure Location is set to Main Navigation if you wish the page to appear in the navigation in the site header. Alternatively, from Location dropdown select Footer Links if you wish the page to appear in your footer menu. Last, click Add Item to save the configuration.