You have several options:
- You can use the CS webmail to connect to your CS mail account. Simply log in using your CS account and password.
- You can use a third party webmail system, such as Outlook.com, GMail or Yahoo. Specific instructions for setting this up will vary by webmail provider so it's beyond our ability to support, but googling for "other" "email" "account" and the name of the provider should get you pointed in the right direction. Note that many of these only allow POP access to your CS email account, so if you plan to still use other email software to access your CS email, choose the settings in your webmail provider's configuration carefully (leave email on server, in particular).
- Forward your mail to a separate offsite address which already provides webmail, such as those mentioned above as well as others.