Webmail enables you to use e-mail through a web-based interface.Webmail is similar to Hotmail or Yahoo mail in that you may access it at any time from any web browser anywhere in the world.

Log into http://webmail.yourdomainname.com.au (replace yourdomainname.com.au with your own domain name).
Your username is the mailname you have set up in the Control Panel for the specific e-mail account you wish to use. eg. If your email address is name@domain.com, your username for webmail is name.
Your password is the mailbox password for that mailname.