To change the FTP password of a web page owner, perform the following steps:
1 - 1 - Logged in to Plesk, https://your domain name:8443.
2 - Go to Websites & Domains.
3 - Click Web Users in the domain settings pane of the domain that contains the personal page.
4 - Click the required user name.
5 - Type the new password into the New password and Confirm password boxes.
6 - Click OK.