OS X Mountain Lion: Use the Wi-Fi status menu to control your Wi-Fi connections
You can display the status of your Wi-Fi connection in the menu bar. You can use the Wi-Fi status menu to switch between Wi-Fi networks, turn your Wi-Fi on or off, open Network preferences, or create a computer-to-computer network.
- Choose Apple menu > System Preferences, click Network, and then click Wi-Fi in the list.
If Wi-Fi isn’t in the list, click Add (+) at the bottom of the list, choose Wi-Fi from the Interface pop-up menu, give the Wi-Fi service a name, and then click Create.
- Select the “Show Wi-Fi status in menu bar” checkbox.
Four signal bars appear in the Wi-Fi status icon in the menu bar. The more bars that are black, the higher the signal quality.