Install and configure an email client. There are a lot of them, many free. If you have the office suite, you've got Outlook, which will do more than you're ever likely to use. Mozella's Thunderbird is a free download, and also does a lot.
Directions for setup of a number of them. http://forums.xfinity.com/t5/Email-Web-Browsing/E-Mail-Client-Settings-customer-generated/m-p/778889