So what I want actually, is to config FTP Server with main IP address, so that I can connect from another PC/LAPTOP to main FTP Server, which atm has localhost or 127.0.0.1 IP address.
If you start the FileZilla FTP Server, it listens on all IPs by default. Just put the IP of the host machine in your client and (assuming you are not being blocked by firewalls, routers, etc) it should work.