I bought an Airport Extreme and am trying to set it up. I installed Airport Utility and have my Airport turned on. The problem I'm having is that Airport Utility is saying it can't find any wireless devices. I have the Airport's Internet WAN port connected to my wall's ethernet port and the Airport's status light is solid green. What I want to do is get a wireless signal from the ethernet port on my wall. Everything in the set up guide and everything I find online has to do with setting the Airport up with a DSL or Cable Modem, so I'm a bit confused as to what I'm doing wrong.