Go to http://webmail.<your-domain-name>.com
For example: http://webmail.digical.com (no www)
Then sign in with your full email address and your email password.
Once you login, you can do various things such as:
- Change your email password
- Setup a Vacation Message or Auto-Responder
- Access your email on the road or on your vacation on any computer that has internet access
- Setup filters for your incoming email