selecting PPPOE Access Concentrator

[(रेवंत) Revant Nandgaonkar]

Dear friends...
my pppoe cant login to the server due to wrong information about
access concentrator,

when i pppoe-discover services on my one and only eth0 interface, it
displays 3 services and 3 access concentrators.

by default it is selecting the wrong AC and Service, and I want to
select 3rd service

how do i select the correct one of them and log in success fully

Thanks