To set up a wireless network, ensure you have a broadband Internet connection, a wireless router and a wireless network adapter. Set up your Internet connection and make sure you place the wireless router where it has a strong signal and minimal interference.
As a security measure, consult the documentation that came with your router and check how you can change the username and password from the default.
To set up your wireless network on Windows 7, go to the Sharing and Sharing Center, click on Set Up a New Connection or Network, click on Set Up a New Network, and then click on Next. The wizard guides you through the process of creating a new network and setting a security key. Depending on your router, you may be offered various options for the security key, such as WPA and WEP. After this, the network is ready for Wi-Fi-enabled devices.
If you are a Mac user, you can use an AirPort base station to create a wireless network. Simply connect the Ethernet to the WAN port on the AirPort base station. The base station creates a Wi-Fi network. Consult the AirPort base station documentation for more information on how to set up the wireless network.