I need to do this because I create a custom taxonomy with the permalink is not possible to create a rule, but I need to get all my Post and than create a sitemap.
Tutorial1. Create Function to add external sitemap, click here
2. Find wpseo-functions.php wordpress-seo\inc\wpseo-functions.php,
3. And paste like this + save , u can using this plugin to edit File Manager Author: mndpsingh287