You can use the Wi-Fi menu to quickly connect to a nearby wireless network.
After you get them in Mac OS X, you should be surfing the web like an old pro. External modem Internet connection for your MacBook. Follow these steps to set up your Internet connection if you’re using your MacBook’s external USB modem: Click the System Preferences icon in the Dock and choose Network. On your Mac, choose Apple menu System Preferences, click Sharing, then select Internet Sharing. Open Sharing preferences for me. Click the “Share your connection from” pop-up menu, then choose the internet connection you want to share. For example, if you’re connected to the internet over Ethernet, choose Ethernet.
If you don't see your network listed, make sure it's nearby and that others can connect to it. It could also be a 'hidden' network. You can connect to a hidden network by choosing 'Join other network' and entering the name of the network you're trying to use.
The strength of each nearby network is shown next to its name. More darkened bars indicate a stronger network connection.
Enter your password
Networks that have a lock icon next to their name require a password. After you select your network, enter the network password when you're prompted. If you don't know the network password, check with the owner of the Wi-Fi network you're trying to join.
Use a cellular device as your Wi-Fi connection
Depending on your cellular plan, your iPhone or iPad with cellular can share its Internet connection with your Mac. When your iOS device is configured properly and is near your Mac, it appears in the Wi-Fi menu as an available connection.
When you select a cellular device as your Internet connection, the menu icon changes to indicate your Mac is currently linked to the device ( ).
If you're in an environment where Wi-Fi isn't permitted (like on some airline flights) you can quickly turn off Wi-Fi from this menu.
When Wi-Fi is turned off, the menu icon changes to and empty indicator ( ). When you're ready to use Wi-Fi again, click the menu icon and choose 'Turn Wi-Fi on.' Then connect to the network you want to join if your Mac doesn't join it automatically.
You can enable and disable the Wi-Fi menu from the Network pane of System Preferences.
If you want to create a temporary Wi-Fi connection between your Mac and another device, you can create your own network from the Wi-Fi menu.
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When you create a computer-to-computer network, the menu icon changes to show a computer (). When you're done, click the Wi-Fi menu again and choose Disconnect to close the network you created.