Hi: I've got my Airport Extreme up & running after much time on the phone w/Apple & Embarq techs. At some point, they walked me through the process of setting up a password for my network, but my MBP automatically logs me on to the network as soon as I turn the computer's Airport on. Want to be sure that anyone else who would try to log on would have to give the password. How can I check for that? Thanks much!