I went to a coffee shop that had Wi-Fi this morning and they gave me the network name and password. In the top-right corner of my desktop there is the Wi-Fi menu, and I selected it to "Turn Wi-Fi On" It searched for a few seconds and correctly found their network.
I then tried to connect to it, but botched/fat-fingered the password and pressed Enter ⏎ by mistake. I then wasted about 20 mins trying to find a way to change the (bad) password that my Mac was using to authenticate with. I gave up and came home.
So I ask: How do you change the password for a Wi-Fi network?
Best Answer
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 "System" keychain in the "Passwords" 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 & Rejoin
You can also solve the issue by deleteing the network and rejoining it. Simply go into your System Preferences > 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.