How do I get this gray box off?

[AC Question]

My phone told me that it had viruses and needed to download this app called cm something and I did and now I can't get the gray box off

 

[josiahlikesminecraft]

Just uninstall the app. It was an advertisement to get you to install that app.

Posted via Lg g3 Running Cyanidel Android 5.1.1