I accidently deleted the Wi-fi interface in the Networks Menu window. HELP!

My computer is now saying that my Wi-Fi is not configured. It wont let me re-add the interface through the network window and I don't know what else to do! It's currently only working through Ethernet. HELP!
WIFI in the tool bar says "Wi-Fi: Not Configured."

Restart the computer and try again. If there's no change, then from the Location menu at the top of the preference pane, select Edit Locations. A sheet will drop down. Click the plus-sign button to create a new location. Give it any name you want. In the new location, set up the Wi-Fi service with the same settings you used before. Click Apply and test.

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