Question
How to connect to a website in Plesk via FTP?
Answer
Go to Domains > example.com > FTP Access to find an FTP user name.
If the password of this FTP user is unknown, click on the username and set a new password.
To create an additional FTP account, click Add an FTP Account. For details, visit this KB article.

Download and install an FTP client.
In this example, we are using FileZilla - a free and reliable FTP client (Download link).
Once FileZilla is downloaded and installed, start it and fill in the fields:
FTP host. The FTP host name should be a server IP address or example.com, where example.com is a website’s Internet address. The website must be accessible from the Internet.
FTP username from step 2
FTP password
Click Quickconnect. After a successful connection, website's data will be listed.