You must have a Wi-Fi network card either integrated or external to your computer.
You will also need to ensure that your Mac OS X 10.5 Leopard has been updated to OS X 10.5.2 or later. Instability issues exist with earlier revisions which may cause your Mac to crash.
When making changes to your System Preferences as described below, you might be required to enter your local Mac password; this will be the password you use to log in to your Mac.
Users are required to install and regularly update antivirus software.