By following the steps below you can easily login to your Plesk Control panel:-
1) First open your browser, and enter the URL where your Plesk control Panel is located for example https://your.domain.com:8443.
2) Now press ENTER. Once you press Enter you will see Plesk control panel Login screen.
3) Insert the login username and password provided in your welcome account information email.
4) If you are logging into Plesk control panel for the first time, then you will need to select the language for your control panel from the Interface language drop-down box and If you had previously specified the interface language and saved it in your interface preferences, leave the User default value selected.
5) Click Login.