Modifying the vsftpd config to isolate ftp user in separate directory ?

Hello, by default, all users point into the same directory ...

I'd like to set it up so that each user end up in different directory ...

I found that command but I'm unable to test it

"usermod --home /var/www/ username"

Reason is, I cannot find the command to restart vsftpd (sudo service vsftpd restart, does not work) and when I reboot the box, I loose my changes ...

I'm I on the right track here ? Do I simple need to add that command and make it "somehow" persist to a reboot ?

Should I remove anything to the original config ?

Thanks in advance

Here's my config file right now ...

# vsftpd.conf for unRAID

# with suggestions from forum user 'nars'

#

connect_from_port_20=YES

write_enable=YES

local_root=/mnt

local_umask=0

#

# No anonymous logins

anonymous_enable=NO

#

# Allow only local vsftpd.user_list users to log in.

local_enable=YES

userlist_enable=YES

userlist_deny=NO

userlist_file=/boot/config/vsftpd.user_list

check_shell=NO

#

# Logging to syslog

syslog_enable=YES

log_ftp_protocol=NO

xferlog_enable=NO

#

# Misc.

dirmessage_enable=NO

ls_recurse_enable=YES