We've got an AirPort Extreme plugged into the cable modem doing main duties, and I want to add an AirPort Express in another room with a printer attached via USB to allow wireless printing to that printer. Trying to install the AirPort Utility from the included disc doesn't work, as it claims it's only compatible with "Mac OS X 10.4 or later" but the computer (MacBook Pro) has 10.7 installed on it. It also has AirPort Utility 6.1 on it, which is the newest version listed on Apple's website. However, I can't seem to get it working.
Plugging in the AirPort Express anywhere, with nothing, or ethernet, or USB cable from printer attached, results in a flashing yellow light and no recognition on the part of the MacBook Pro's AirPort Utility.
What am I missing? How am I supposed to get this setup?