How do I do that? I open up the Airport Utility and it sees the AE. But after pressing the configure button, it says there's a problem and I must check that it's connected to the internet. I can't have it connected to the internet because the cable modem is upstairs. I have the cable modem upstairs connected to a wi-fi router, the iMac is in the living room downstairs, and the printer is in the spare room downstairs. I wan't to be able to print wirelessly to the AE in the spare room from the iMac in the living room. How do I get the iMac to see the AE's printer? It seems I can't even set it up w/o having it connected to the internet.
Would it work if I plugged it into the router upstairs just to configure it, then unplug it and plug it in downstairs with the printer?
I thought maybe a graphic would help. See below. There's no way for me to run wires. And there's no way for me to get either the printer upstairs, or the cable downstairs. So I'm stuck in this setup. The AE as a wireless printer server w/o internet would solve my problem.