I followed the website, and there doesn't seem to be one for FIFA 10, but there is one for CoD: WaW and I followed that so I shall check if that works soon.
I tried to do FIFA 09 on it but it said that my modem couldn't forward enough ports I think.
I've had a look at the article, but I'm not sure how to open ports and such, where do I need to go? Any help with that would be greatly appreciated also.
NOTE: I don't know if this helps but as I said I can't play head to head with my friends but I can play be a pro with them.
Well, the problem has always been there, It did the exact same thing with FIFA 09 also, but I could play online with my friends on CoD: Modern Warfare on the Xbox 360.