You can access webmail by going to your domain's URL with /webmail after it. For example: http://www.yourdomain.com/webmail. You login with your email address and password. There are several webmail clients to choose from; Horde, Round Cube, and Squirrel Mail. These clients all go to the same email, just in different formats and with different features. Use the one you like best. Make sure to try the 'Help' links in each webmail client to learn more.
Also, there are links at the webmail screen to allow you to change your password, see email settings for your POP client, set up forwarderrs and autoresponders and more.
