You do not have to agree to any EULA or license like you do in FreeBSD or NetBSD, after you install the firmware.. and reboot.. you can scan for access points using the "scan" command.
There have been several different ways to scan for access points in the past, but now it has been finally decided upon.
$ sudo ifconfig ipw0 scan
This will produce a list of access points that are within range, from there you can figure out the proper configuration settings to use..
Wireless is rather sporadic.. using the
hostname.if(5) files may not be reliable if you're not always going to be in the vicinity of your network.. manually configuring the interface is probably the best method.
Good luck.. but do considering posting the output of dmesg and ifconfig, you can obtain it via an Ethernet connection.. or by saving it to a floppy or USB drive.