There are two types of Road Runner email accounts: master user and sub user. Sub user email addresses can be deleted online in only a few steps, though you must be capable of logging in as the master user. Deleting a master user email address cannot be accomplished online; you are required to call Time Warner's Road Runner customer service and speak to a representive.
Sign into your Road Runner master user email account.
Click the "Manage User" link next to the email account you wish to delete in the "User Management" window.
Select "Delete," and press the "Update" button.