You can always access your webmail on your own domain. For example, you can browse to http://webmail.yourdomain.com/, where you simply replace "yourdomain.com" with your actual domain.

Alternatively, you can access it via https://cpsrv01.misshosting.com:2096/ if your web hosting is on the server named "cpsrv01". Double-check this with support if you're unsure about which server your web hosting is on, and replace "01" in the link with the appropriate server number.