Q: Open ports on AirPort Extreme 7.7.7

I am wondering on how to open ports on the AirPort Extreme version 7.7.7.

I have talked to Microsoft about certain ports I need to have open for my Xbox and have the list of ports. I am just looking for how to do this. I have no experience with this kind of thing and I know I can do it in the AirPort Utility app, however I do not want to mess with anything I shouldn't have to. I have tried looking up guides online for this and I can't find anything that's recent. When I watch videos, everything is a little different and the interface isn't quite the same anymore so any help is appreciated.