Accedentally deleted Wifi in system preferences, can't get it back.

HI,

I accedentally deleted my wifi option in system preferences. I can't seem to find a way how to get it back. I tried the little plus in the bottom right but the option for wifi wasn't there. I figured out that it was a problem with my airport card, so I got it replaced. I got my Bluetooth back up but I can't seem to find a way to get my wifi working again.

Anything helps 🙂

Thanks 😉

Macbook pro mid 2012