With wifi on I get an automatic connection to a dead  network. I need to delete it

I can't seem to find a way of not automaticly connecting to this no password network. It is dead and I have to turn of wifi to use both my Iphone and Mac book on the web.

Try this on your MacBook Air:
1a. Delete Preferred Network(s)
System Preferences > Network > AirPort > Advanced > AirPort tab
Under "Preferred Networks," delete the network(s) you regularly use from the list.
1b. Delete AirPort Keychain Entries
Launch the "Keychain Access" application located in Applications/Utilties.
Click on the "Kind" filter at the top, and look for any "AirPort network password" entries...and delete them.
1c. Add Preferred Network(s)
System Preferences > Network > AirPort > Advanced > AirPort tab
Add the preferred network(s) using the "+" button.
Restart or log out then back in.

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