The best solution will be contact your ISP asking for help, they should tell you wich url you need to access your router settings through the internet in order to forward your ports properly.
I forward my ports with the CD I have for installing my router or through my web.
You should have this option (web) as well.
If you have a CD to install the router, look there some option as Forwarding ports, or similar. If not, ask your ISP for the link to your router web.
Oh, the ports issue is a pain in the ass, really, but you will find a solution at last. Good luck!
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