Logging into your Plesk email configuration

Type "https://smtp.ctsmail.net:8443" into your web browsers address bar, or click link.
Click "Yes" to proceed on the security alert window.

Enter your email address in the login field (example: johndoe@ctsmail.net).
Enter the password you normally use to log in to your email.
Click "Login"

You should see a screen similar to this one. This is your control panel where you can change your password, redirect your mail, ect.)
For more information on using these options you can view the control panel user guide (pdf format)