Help needed with Wifi router

Hi, i recently got a Belkin ADSL2+ Modem with wireless G Router. I have setup a secured network using the setup cd that was provided. If i have to access this network, i need provide DNS settings manually in the Lan settings. How do i configure the router such that, if i am trying to connect, say my laptop to this network, all that has to be provided is the passkey. Please help me out. Thanks.