Click the Wi-Fi icon from the tray along the top of the screen then click Open Network Preferences... From the menu on the left, click Wi-Fi Click Advanced... Click the Wi-Fi network you want to remove (or ⌘+click to select multiple networks) and click the minus sign to remove the network Click Remove in the window that pops up

Leaving the Domain Open System Preferences Select "Users and Groups" Select "Login Options" from the side menu Click the lock icon in the bottom left hand corner enter in the macadmin credentials Click "Edit" Select the joined domain Click the '-' to remove from the domain Reboot the Mac Joining the Domain Open System Preferences Select "Users and Groups" Select "Login Options" from the side menu Click the lock icon in the bottom left hand corner enter in the macadmin credentials Click "Join" Enter into the text box "judsoncollege.edu" Enter your credentials to complete the joining the domain process Reboot the Mac