1. Click the Apple menu icon and select AirPort.
   
2. If necessary, click the arrow beside Settings so that it points downward and the AirPort settings appear beneath.
   
3. If the Turn AirPort On button appears, click it to turn on your AirPort connection.
   
4. The 12-character alphanumeric combination listed as AirPort ID is the MAC address.
   
5. Click here to register your MAC address.

Alternative Setup

1. Click the Apple menu icon and select Apple System Profiler.
   
2. If necessary, click the arrow beside Network overview so that it points downward and the Network settings appear beneath.
   
3. If necessary, click the arrow beside AppleTalk so that it points downward and the AppleTalk settings appear beneath.
   
4. The 12-character alphanumeric combination listed as Hardware Address is the MAC address.
   

Register your MAC Address

1. Go to the Apple Menu and select AirPort.
   
2. Click the arrow beside Settings to get the setting details.
3. Under AirPort, make sure it says AirPort: On as shown below. If it does not, select the Turn AirPort On button.
   
4. Under AirPort Network section, click the Choose network menu. Select Create Computer to Computer network... from the menu.
   
5. Type NSU in the Name text field and click OK. Now you can close the AirPort window.
   
6. Next, go to the Apple Menu and under Control Panels, select TCP/IP.
7. Select AirPort from the Connect via menu. From the Configure menu, select Using DHCP Server.
   
8. Close the TCP/IP window and click OK to save the changes made.