Limit Users Access to Folders?

I used search and got nothing :( so sorry to make a new topic. How do i limit which folders certain users can access? I'm basically new to this whole ftp server thing :O if you think that it lies somewhere in my ftp software i guess i should check www.proftpd.org

O.o plz ignore this all was found in the proftpd.conf file o.O

or if you want to use this for general purposes look up man chroot
man chmod