How can I set up vsftpd running under system user with mysql?

I try to run vsftpd with mysql following contents.

http://www.howtoforge.com/virtual-hosting-with-vsftpd-and-mysql-on-ubuntu-12.04

But, it seems to run under the user "vsftpd" and I cannot change the directory holded by login user.

Does anyone know how to run vsftpd with login user.