Port-forward port 5003 the same way as you must have port-forwarded port 591 for IWP.
Launch FM and select File -> Open remote. Change the 'Local Hosts' dropdown to be 'Favourite Hosts', and 'Add'. Add the URL hostname.dyndns.org (you can give it a friendly name also) and 'Save'.
Now in the left pane of Open Remote click on that server and you will see in the right pane the shared files.
It will work inside your LAN also, so you can test it first.
Nice..... thanks for your big help.~!