Your username is the first part of your Grande email address. For example, If your email address is: [email protected] or [email protected] then your username is "username_xyz" (without the quotation marks). Your password is your current Grande email password.
Grande email gives you the ability to check your email from any computer with Internet access. You can use any web browser, such as Internet Explorer or Firefox. Type http://webmail.mygrande.net in the address bar of the browser. Once the page has loaded, click Mail and enter your email address and password.