I cannot figure this out. There seems to be no checkbox or anything similar in function to add the newly created custom post type archive page into the menu.
Also the link must be active, if you are on the page. This probably isn't possible, but is there some plugin for it? For the love of me, I cannot find it :(
I only found this plugin called Custom Post Type Archives in Nav Menus, that doesn't really do anything, but add custom link to the menu..with the full site-url. It doesn't go active or isn't very dynamic.
I thought that, probably the easiest way would be to override
wp_nav_menu() and add my links manually and then use
$_GET information to control the "currently active link".