Are you trying to navigate to an external page or redirect? (Also, bear in mind that was posted almost 3 years ago...in websites and technology in general, that's an eternity!)
You could always just add a custom link to the WordPress menu under Appearance->Menus. Just make sure you add support in the functions.php file.
And here for adding theme support:
This is how you would add functional support:
//setup the dynamic navigation
"main_nav" => "Main Navigation Menu"
Then go to the admin panel->Appearance->Menus, and add your external link there.
Then in your template, you would call it like so:
<?php wp_nav_menu(array('menu' => 'Main Nav Menu')); ?>
This is, ofcourse, what you were looking for