To allow anonymous FTP access:
1) Login in to your Plesk Control Panel.

2) Click "Subscriptions" at the left.

3) Click on subscription name.

4) Click "Websites and Domains" tab.

5) Click on FTP Access.

6) Click "Anonymous FTP" tab at the right.

7) Click "Switch off"

8) Here you can see that when button is switch on you can see the message ( FTP settings were saved).

9) Enter information according to your need then click ok.

10) Here you can see that Anonymous settings were saved.
