HELP, Limit bandwith on eircom d100 router

I have a new eircom d1000 router on a 8mb eircom package

I need help if anyone can

I need to limit the bandwith on LAN port 4 to 5mb as that port goes to my sons playstation where he uses Netflix and it takes up all of the bandwith

I rang eircom and they tole me to set up QOS in my router, I found this, but how do I tell it to give lan port 4 only 5mb or even the mac address of the ps3, I don't know how to set up the classifiers or queue's

any help would be great

thank you