How to change password of subscription's system user in Plesk?

Plesk for Windows Plesk for Linux kb: how-to

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How to change the password of the subscription's system user in Plesk?

In Plesk interface

Log into Plesk.
Go to the menu Web Hosting Access:
- In Power User view: Websites & Domains (select a webspace in the top right corner if necessary), scroll down to example.com and select Web Hosting Access:
- In Service provider view: Domains > example.com > Web Hosting Access:
For more details about Plesk views, see Plesk Onyx Administrator's Guide.
In the section System user, set the new password of the system user in the fields Password and Confirm password and click OK or Apply to save the changes:

Directly on the server

Connect to the server using SSH or RDP.
Execute the following command to change the password of the subscription's system user:

# plesk bin subscription --update example.com -login user -passwd 'password'