darn, you got there before me :-D
you need setprism2defaults to tell the prism2.device how and what it is connecting to...
did you get the easynet software with the card?
for testing, set the router up to be an unsecured wireless network with the network name all in uppercase. you can worry about sorting out the name and security once its all working.
it doesn't matter if the router is a DHCP server. leave it running as such. Just set your amiga to have a static IP quite high in the range so it won't get re-assigned by the router.
set your router's IP address as the gateway and DNS server, and subnetmask as the same, and you should be laughing...