cant join online session

[speedy jon]

hi guys, id never been online with phoenix before but a few guys in the club do so i thought id join in the fun or well try to join. iv updated it to the latest 2.5m. but when i try to join it says
you may need to forward udp ports 26500-26505 on your router to your computers internal ip address
i dont hav a clue wot this means. any simple sets to help me sort this out.
i have bt home hub if this is any help.


cheers Jon