Harry, here is my filezilla settings
http://imageshack.us/photo/my-images/819/0l80.png/
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add the ip address of your router. The public ipaddress. you can get this from googling "whats my ip address"
the port default is 21.
make sure port 21 is open on your router and then it should work.
If you want to get fancy, set up a dlinkdns server so that you dont have to update your ip address.
I also set up a username and password on my dlink dns323 control panel. For some reason I had to set to 2 connections in the ftp server for it to work.
I hope that helps