i tried to install ProFTPD Server in my Linux Centos server but when i try using the command you sent me it doesnt work, this is what i send in the shell terminal:

yum install proftpd

i get this:
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* addons: mirrors.xmission.com
* base: mirrors.versaweb.com
* extras: mirrors.combinetworks.com
* updates: centos-distro.cavecreek.net
Setting up Install Process
No package proftpd available.
Nothing to do

how do i install ProFTP on my server then?