I have some custom taxonomies associated with posts or pages or any custom post types but they are not showing on settings dropdown. What to do next?

Free version of this plugin has some limitation. You can republish a particular post of a custom post type upto 3 times. After that plugin doesn’t republish those posts anymore. You have to use Premium version of this plugin to use it more than 3 times for custom post types. Also, Post and Page do not have such limitations in the free version. Taxonomies, other than Category and Post Tags, are available only on premium version.