Change Name Servers — Support — WordPress.com
All domains registered through your WordPress.com account will use WordPress.com’s name servers by default. If you make any changes to the name servers, or if you transfer in an existing domain from another provider, you may need to change the name servers in order for your domain to correctly point to your WordPress.com site.
Domain Search — WordPress.com
WordPress.com is the best place for your personal blog or business site. WordPress.com. Log In Get Started Your next big idea starts here Find the domain that defines you. The right domain is all you need. Just one click and your domain is a website. It’s your new blog. Or …
Support — WordPress.com
WordPress.com Support. Start. Build the site of your dreams with WordPress.com. Learn about our best features, and how to get started.
Change Domain Name
Just want to add, you can certainly use your .org name you registered somewhere else other than WordPress.com for your site parked at WordPress.com. But, as the moderator said, you’ll have to contact WordPress.com support at the link provided, as these forums …
WordPress WP_HOME and WP_SITEURL settings. There are 2 WordPress options that you can adjust to change the behavior of how WordPress works. WordPress Address (URL) / WP_SITEURL: The address where your WordPress core files reside. Site Address (URL) / WP_HOME: The address typed in a browser to reach your WordPress blog.