In addition to the password reminder link on the login screen, you can
use the plesksrvclient.exe utility located in the %plesk_bin% folder
to view the password or set up a new password.
To view the current password, issue the following command:
"%plesk_bin%plesksrvclient.exe" -get
To set a new password, issue the following command:
"%plesk_bin%plesksrvclient.exe" -set <new_password> true