Wireless connectivity issues with T2-B-Gawv1.4U10Y-BI

HiI have a T2-B-Gawv1.4U10Y-BI router. It connects to Internet fine, but WLAN doesn't seem to work.Everything looks ok from the router admin page, and laptop and kindle pick up the signal 100%. But when trying to connect WPA2 or no authentication its not accepted. Any ideas?What is 'TxPower' by the way? It was set to 20%.

You should be connected in PPPoE mode ( USERID/PW stored in modem )
Enable DHCP.
Change TX power to 100%
wait.... for similar models with screen shots.
https://docs.google.com/present/view?id=dq4nnjx_14fhxf7xcf
https://broadband.forum/bsnl-broadband/61886-wifi-configuration-bsnl-vmc-an1020/10/#post416591

Thanks. But why should PPPoE mode have anything to do with the WLAN connection?