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Source: https://support.apple.com/en-us/102480
Removing SSID and saved password information from Keychain Access
Click the magnifier search icon in the upper right of the screen (next to date/time).
Type Keychain Access in the search field and then select Keychain Access
Using the search tool in the upper right of the Keychain Access app, search for CanisiusWireless. Note: If present, the entry type for this will be “802.1X Password”
Select and delete CanisiusWireless
Rinse and repeat above steps to remove other applicable entries like gryphon and/or CanisiusGuest