The Panel initialization - also known as initial configuration - is the first thing done to the Panel after it has been installed. Until the Panel is initialized, any other operations are prohibited. Initialization sets the Panel administrator password, e-mail, and contact information.
When Parallels Plesk Panel is installed, a random password is generated for the user 'admin', which replaces the old scheme when the same default password was used on all installations. This change was done to protect servers with freshly installed Panel from hacking by bots that use the default password.
After the installation is finished, you can set the admin's password being authenticated in the Panel with credentials of the server system power user, that is "root" on Linux systems, and "Administrator" on Windows systems.
To initialize the Panel: