Help Set Up Wifi On Iball Baton

I have an iBall Baton of model iB-WRA150N .The device is a ADSL2 modem+Router. I have a BSNL Broadband connection and I can access the internet in Bridge Mode.But I cannot set up the WiFi.Thus I can only use the modem part of the device.Please help with any suggestions on how I can set up an wireless connection.