You will need access to your Mac’s Administrator account and you will need the name of the wireless router or Airport you are trying to recover the password from.
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Launch Keychain Access located in /Applications/Utilities/
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Sort the Keychain list by “Name” and locate the name of the wireless router that you forgot the access password to
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Double-click on the router name
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Click on the checkbox next to “Show Password”
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Enter the Administrator password when asked and click “Allow”
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The wireless access password will now appear for you to paste it elsewhere in readable form.