In this part of exercise we will make area where anonymous can upload their files. You should make directory with right permissions. In this case I will make that in /var/ftp directory.
OK now you are finished with basic things, as permissions and selinux type, also and ownership. Change file /etc/vsftpd/vsftpd.conf and add next:
chown_username=root don't use this!
man vsftpd.conf is your friend :) After this you can start your ftp session and upload data on system