If TCP/IP is not in the Control Panels folder follow these steps to re-enable it. This page assumes that the control panel has been disabled and not deleted.

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Click on the Apple Menu. Go to Control Panels and choose Extensions Manager.



Scroll down until you see TCP/IP.  If it has been disabled there will be no X in the box to the left of the icon.



Click the box to enable the TCP/IP Control Panel.



Click the Restart button at the bottom of the Extensions Manager. A restart is required to finish enabling the Control Panel.



After the Mac is finished restarting the TCP/IP Control Panel will be available.