By default, your OSX device attempts to join the same wireless network that it was most recently connected to.


If you’re in an environment with more than one wireless network, you can set up your Mac to join a preferred network when you start your computer, wake it from sleep, or turn Wi-Fi on.


OS X keeps track of the wireless networks your computer has connected to, and lists them in the Wi-Fi pane of Network preferences.

  1. Choose System Preferences, then click Network.

  2. Choose Wi-Fi in the network connection services list, then click Advanced.

  3. Find the name of the network that you prefer to join (SAD6-Wireless). Click on it and drag it to the top of the list to give it the highest priority. This is the network your computer will try to join first.

To delete a network from the list, select it, then click Remove  .