Change your name-servers with wordpress.com name-servers.
Before Upgrading – Important Notes
WordPress.com automatically removes the “www” from all URLs. Mapping the “www” subdomain is not supported. Also, they do not currently allow mapping to subdirectories, such as example.com/blog.
Instructions for Mapping Subdomains
- Add a CNAME record through the registrar where you purchased your domain or through your DNS provider. You should NOT change your Name Server information if you wish to only map a subdomain. The CNAME should look something like the following (please note the fullstop character at the end of each domain name):
blog.get-murmur.com. IN CNAME murmurapp.wordpress.com.
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Once the CNAME record has been added and verified, go to Domains and add the subdomain to your blog. If everything is configured correctly, you will be prompted to pay for the upgrade and complete the mapping process.
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After you have made your purchase, go to My Domains, select the
radio button next to your custom domain, and click the Update
Primary Domain button.
Please note, you may see a Redirect Loop error page if you immediately visit your site after setting a new Primary Domain. This is usually fixed within a few seconds by refreshing the page.
Adding a Subdomain if your Domain is Registered Elsewhere and Mapped to WordPress.com
Occasionally even if you already use a domain that you’ve registered elsewhere with your WordPress.com blog, you may wish to have a subdomain as well. For example, you already own the domain get-murmur.com, which you have mapped to your WordPress.com blog at murmurapp.wordpress.com. Now you want a new domain called blog.get-murmur.com.
Your murmurapp.wordpress.com which will hold the content at blog.get-murmur.com. Be sure to do this while logged in as the same user that owns the primary domain.
Once the new blog has been created, while still in your kittens.wordpress.com Dashboard, map your new subdomain directly through WordPress.com. So in this example, you would purchase domain mapping for blog.get-murmur.com.
Be sure to set your new subdomain blog.get-murmur.com as your primary domain in My Domains in your murmurapp.wordpress.com Dashboard.
Note: if your domain is already registered with WordPress.com or mapped to a WordPress.com blog, you do not need to add any kind of CNAME record.