Problems with replacing the Plusnet TG582n Router with Airport Extreme

[#1]

Any help would be appreciated.
I got a BT modem (supplied by PlusNet) to connect to my fibre .. This is connected to the Plusnet Technicolor Router TG582n
I want to replace the Technicolor Router with my Airport extreme, as its 100 time better and can support my music network of Airport express's around the house.
My current attempts to configure the Airport Express to use my PlusNet Login details though PPPoE are failing  ... What have I missed! Apparently it is possible according to dvorak on the tread:- https://community.plus.net/forum/index.php/topic,126025.0.html
Thanks in advance
Christopher

[#2]

Oh god worked out my username was wrong .. All working fine .. And buy what and improvment!!