Probleme proftpd

oui j arrive a me connecter depuis tout a l heure je galere pour restreindre l accés ftp ,mais de nouveaux problemes se posent a moi:
-dans ftpusers j ajoute anonymous afin de ne pas permettre l accés ftp ?

-comment mettre un mot de passe +utilisateur?

-je modifie bien le fichier proftpd.conf comme ceci
ServerName "ProFTPD server"
ServerType standalone
DefaultServer on
UseFtpUsers on
# Allow FTP resuming.
# Remember to set to off if you have an incoming ftp for upload.
AllowStoreRestart on

# Port 21 is the standard FTP port.
Port 21

# Umask 022 is a good standard umask to prevent new dirs and files
# from being group and world writable.
Umask 022

# To prevent DoS attacks, set the maximum number of child processes
# to 30. If you need to allow more than 30 concurrent connections
# at once, simply increase this value. Note that this ONLY works
# in standalone mode, in inetd mode you should use an inetd server
# that allows you to limit maximum number of processes per service
# (such as xinetd).
MaxInstances 30

# Set the user and group under which the server will run.
User nobody
Group nogroup

# To cause every FTP user to be "jailed" (chrooted) into their home
# directory, uncomment this line.
# Normally, we want files to be overwriteable.
<Directory />
AllowOverwrite on
</Directory>

# Needed for NIS.

Persisentpasswd off

<Global>
DefaultRoot ~
AllowOverwrite yes
MaxClients 3
MaxClientsPerHost 1
UseFtpUsers on
AllowForeignAddress on
ServerIdent on "ProFTP Server Ready"
AccessGrantMsg "Bienvenue %u sur le serveur du "
</Global>
# Default root can be used to put users in a chroot environment.
# As an example if you have a user foo and you want to put foo in /home/foo
# chroot environment you would do this:
#

# DefaultRoot /home/foo foo
#Include /etc/proftpd-anonymous.conf