Your blog's Dashboard is located at http://randomobscurities.wordpress.com/wp-admin/
You are welcome to keep your domain with us and update the nameservers to point to another hosting provider by following this guide:
http://en.support.wordpress.com/domains/change-name-servers/
After 60 days from the date of purchase or registrant contact information change, you may also transfer your domain to another registrar by following this guide:
http://en.support.wordpress.com/domains/transfer-domain-registration/