Once you have your Wi-Fi client hardware installed, you need to set up your Mac to use it. You can do this in two ways. The easiest way is to use the AirPort Setup Assistant, which is a program that configures your Wi-Fi hardware and AirPort software with almost no input needed from you. The other way is to use the Internet Connect application and Network Preferences to set the AirPort preferences that you need.
You'll find the AirPort Setup Assistant in /Applications/Utilities/. Follow these steps to set up your AirPort hardware:
Launch the AirPort Setup Assistant. The Introduction screen will appear, as shown in Figure 2-9.
Choose "Set up your computer to join an existing AirPort network."
If there is more than one AirPort network available, as in Figure 2-10, choose which network you wish to join from the "Available AirPort networks" pop-up menu. If there is only one AirPort netowrk available, this pop-up menu will not appear.
If the network you selected requires a password, the Enter Network Password screen will appear, as shown in Figure 2-11.
Type the network password, then click Continue.
The Conclusion screen will appear, letting you know that the AirPort Setup Assistant is ready to configure your computer. Click Continue.
The AirPort Setup Assistant reports that it was able to make the connection to your selected network. Click Done.
To connect to a wireless network manually, use the Internet Connect application found in your Applications folder. You can also use the AirPort pane of Network Preferences for some settings.
Follow these steps to use Internet Connect:
Launch Internet Connect.
Click the AirPort button in the Internet Connect window's toolbar.
If AirPort is turned off, click the Turn AirPort On button.
From the Network pop-up menu, choose the network that you want to join, as shown in Figure 2-12.
As you can see in the figure, the Internet Connect window has a signal-level meter that indicates the quality of the Wi-Fi signal you are receiving.
It's a good idea to click the "Show AirPort status in menu bar" checkbox; doing so makes the AirPort menu appear. This menu shows available wireless networks and allows you to switch between them, as shown in Figure 2-13.
Choose File Quit to leave the Internet Connect application.
Follow these steps to use the AirPort pane of Network Preferences:
From the Apple menu, choose System Preferences. The System Preferences application will launch.
In the Internet & Network section, click Network. When the Network pane appears, set it to display Network Status, as shown in Figure 2-14.
From the Show menu, choose AirPort (if it isn't already showing). The AirPort tab lets you choose to join a specific network by default, or any network, as shown in Figure 2-15.
Click TCP/IP. This tab, shown in Figure 2-16, shows the computer's IP address, subnet mask, and the router IP address that the computer has obtained from the wireless base station.
Click AppleTalk. The AppleTalk tab appears (Figure 2-17).
If you want to run AppleTalk over AirPort (used for some printers and some file sharing with older versions of Mac OS), click Make AppleTalk Active.
After you have set AirPort up, you will rarely need to make changes, if at all. Most often, you'll only need to switch between different wireless networks. For that task, you can use either the Internet Connect application or the AirPort menu. It's usually easier to use the menu. Simply choose the wireless network you want and, if necessary, enter the password for the network.