How do I remove my existing wi-fi networks/settings and create new network.  Have lost passwords to the networks.

I have Imac that was upgraded from Snow Leopard to Lion.  Originally had an ATT Modem that with wi-fi to our Imacs.  Original modem quit working and ATT replaced it with a different modem and wi-fi network was changed.  During these changes and subsequent support(?) calls with ATT the passwords were changed and/or lost.  Using an ethernet connection now which works fine but would like to go back to wi-fi.  However, can't get into either of the previous wi-fi networks or make changes since we don't have a working password.  How can I completely deletes the existing wi-fi networks and establish a new one?  And, If I bought an Apple Wi-Fi base station, could I connect it to my ATT modem and then set up a network using the base station. At one time we were told that we had to use the ATT modem since we are on ATT DSL so I am not sure what will work with that modem or won't work.

Is the wireless network for Internet access provided by another AirPort (Express, Extreme, or Time Capsule) router?

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