I give up! Two days to get this thing working and no success. So much for the majestic Mac machines and OS X that people literally worship. Its just another imperfect device and system that frustrates consumers just as much as any other OS.
are you serious??? if you can't simply set up WPA2 on a router you have to blame apple. amazing logic..
anyway, if you decide to quit blaming others instead of simply blaming yourself for your inability to learn basic level wifi router security, here's what you can do to prevent someone from quickly busting in to your network:
hide the ssid (which is easy to find anyway, but it may help)
enable mac filtering
disable uPnP on the router
disable VPN and any other pass throughs including port forwarding
use WPA2 BUT with a 63 character password using ASCII
since you probably won't understand how to remember a 63 char password, you dont: you use a password manager like 1password (which encrypts the keychain file using 128AES)..
this is not rocket science, really it's not, but don't blame others for you inability to learn BASIC computer security.