Properties dialog box – External Link tab
Site Manager – File > File Properties (when an external link node is selected in the site tree)
URL
Specifies the URL of the external link.
Navigation title
Specifies the navigation name of the node.
Parent node
Shows the navigation name of the parent node.
Previous node
Shows the navigation name of the previous sibling node.
Next node
Shows the navigation name of the following sibling node.
Enable navigation
Specifies whether to include the node in navigation bars.