If you are doing this manually, use ftp on the IBM i. Type ftp on the command line and press enter. It will prompt you for system address. IP address or url are both acceptable. Once connected, use the put command. put \ifs directory\file destination directory\file. If you plan to automate the process, you will need to create a source member that contains the script for the ftp process.
put \ifsdirectory\filename \destination directory\filename
The script will be used by a CL that runs ftp. The CL will need the following:
ovrdbf file(input) tofile(qtxtsrc) mbr(ftpscript)
ovrdbf file(output) tofile(qtxtsrc) mbr(errlog)