opening ports on speedstream 6300

I am with Bell High speed internet, and they issued me a SpeedStream

6300 router. I am tryin to open some ports to my entire network however i can't seem to figure it out, there is the option to port foward under 'applications' however thats only good for one machine on my network i want to open a port to the entire network. I called Bell technical support line, and his response was 'bell does not support that feature, and i am not trained on that topic" he then told me to google it, lol.

Thanks in advance