[ubuntu] FTP Help! Noobie trying to learn!

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http://ubuntuforums.org – So as the title says...I am a beginner with creating a FTP server. I found a proftpd guide here on ubuntu forums and followed that guide to install proftpd and also configure the proftpd.conf file. I created a directory in /home/FTP-shared called "download" to put my files in there for access. I can connect to my ftp server on my computer by typing in ftp://localhost and typing in the correct credentials. But what I really want to be able to do is access my ftp server that I just built on my linux box from literally anywhere (school, iphone, brother's computer, etc). Could someone (HowTos)