>>> I am using a pc card to install the wireless card

I think we need more information in order to be able
to help.  For example, why you think it doesn't work?
What have you tried?

m0n0wall does not automagically setup new hardware.
The only thing that is automatic is the first
ethernet port comes up as 192.168.1.1,
with a netmask of 255.255.255.0

Once you are in, you can use the Interfaces/Assign...
screen to define the other interfaces.