Note :- phpftpwho must be installed on the same machine that is running Proftpd server.
Download phpftpwho from here using the following command in apache web server root document folder (/var/www)
Now you have tar.gz file you need to extract using the following command
# tar xzvf phpftpwho-1_05.tar.gz
Now you should be having phpftpwho folder in your apache root document folder(/var/www)
If you want to access your phpftpwho program you need to go to http://yourserverip/phpftpwho
Now you need to login into the ftp server and refresh your phpftpwho page you should see similar to the following screen