help in pppoe connecting please...

Hello
sory for my english

I want to connect pppoe over wifi

the method is to connect to my wireless network then configuring pppoe connection

the first step is ok ,my usb wifi adapter connected to my network but in order to login i must

configure pppoeconf


http://www.vivaolinux.com.br/imagens..._pppoeconf.png

iam using KNOPPIX 6.2.1

when I use the command pppoeconf it sat command not found???

i need the configuration above to enter username and passward

how can i configure pppoeconf or any other method

thankyou