I have an existing domain through another provider, christinesunderland.com. I purchased a WordPress domain mapping upgrade so that visitors to christinesunderland.com will be pointed to christinesunderland.wordpress.com. I updated the custom DNS records in WordPress, and the new mapping works. Now, I want visitors who type in 'blog.christinesunderland.com' to go to christinesunderland.wordpress.com/blog. Currently, the blog sub domain goes to the main static page. I want it to go to /blog. QUESTIONS: 1) Do I need to purchase a separate domain mapping upgrade for the blog sub domain? 2) Is this something I can do for free either in the WordPress.com DNS records, or the third-party domain registrar DNS records?
The blog I need help with is christinesunderland.wordpress.com.