How to change incorrect Wi-Fi password?
There are two ways to do this...
Modify the Password in Keychain
You can do this under Keychain Access.  You will find all your saved Wi-Fi networks under the &quot;System&quot; keychain in the &quot;Passwords&quot; category.
Double clicking on the SSID (mine are redacted for security) will bring up a dialog box with the details for that particular Wi-Fi network.  From here, you can enter in a new password.


Delete the Network &amp; Rejoin
You can also solve the issue by deleteing the network and rejoining it.  Simply go into your System Preferences &gt; Network and select your Wi-Fi Adapter.  Click on the Advanced... button and you will be able to delete your Wi-Fi Network.  Just rejoin and enter in the good password.