Airport Extreme Security Question

[itsmylittlebrothersbike]

You would need set up your network from scratch. First, set up the AP extreme that is hooked to your G5. While setting it up, choose the type of security you need. Now all you need to do is add the AP expresses back one at a time. As you add them to your AP extreme network, they get secured. Now your network is password protected from those pesky neighbors. Good luck.