Trying to use Citrix GoToMeeting on 2710n and it won't allow the connection. How can I set the firewall so I can enable the connection when I need to use it and disable it (to maximise security) when I don't?

Citrix sent me a firewall config guide. This states that ports 8200, 80 and 443 can be used, but 8200 is optimal. It also specifies several explicit IP ranges that should not be scanned or filtered by content or application data scanning.

Would really appreciate an idiots guide to this, as I'm not technically adept.

Thanks