How to Add a Custom Link
First, however over ‘Appearance’ in the Admin Menu, then select ‘Menu’.
On the Menu page, click Custom Links.
This will bring up a new widget box, like the screenshot below.
You can now paste or type the URL of the website, along with the title of the link in ‘Link Text’.
This will now add the custom link to the menu list. You can now reorder the link by dragging it up.