Rooted Android won't connect to WiFi

I have a Samsung GT-N8013 note 10.1 I bought used off eBay. It appears to have been rooted. It has superuser and WTRP on it. I'm completely illiterate when it comes to all this rooted business. I would like to unroot it but I'm totally lost. Honestly if I can get the Wi-Fi to work is leave it alone. I tried uninstalling superuser but it just spins and spins. I have an SD card but I'm lost as to what to put on it.

Please help! Also keep in mind I know very little about this so please try to be thorough in your response, small steps.
Thank you in advanced for your help!!

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