Just follow this step-by-step tutorial to find out how to forget a WiFi network on your Mac.
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Click the WiFi icon from the top menu bar and click on Open Network Preferences...
Or you can open the Network preferences by going to Apple menu > System Preferences > Network.
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Make sure Wi-Fi is selected in the list on the left and click the Advanced... button.
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From the Preferred Networks list, click on the Wi-Fi network that you want your Mac to forget and click the remove button (–).
Click Remove if you are asked to confirm.
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Click OK and Apply.