Domains »Domains Settings
You can make changes to your domain(s) by visiting Store → My Domains in your Dashboard.
Getting a Custom Domain
If you’d like to replace your site’s WordPress.com address (such as yourgroovysite.wordpress.com) with a custom domain name, please see the Add a Domain page.
Changing Your Primary Domain
You can switch back and forth between your custom domain and your default .wordpress.com URL by updating your primary domain. To do so, simply click on the radio button next to the URL you’d like to appear in the navigation bar when someone visits your site. Then, click Update Primary Domain.
Renewing or Canceling a Domain
If you are trying to renew or cancel a domain you can do so on the Store → My Upgrades page. Visit this My Upgrades support page for more information.
By clicking on the Edit Domain button on your Domain Settings page, you can add custom DNS records to your domain.
You can manage contact information for your domain, control what servers your domain points to, and transfer your domain to another registrar by clicking the Edit Domain button.