Signup Code plug in has shut my site down. What file do I delete though my cpanel to get rid of plug

I can’t get to my wp admin because the signup code plug in is not compatible with the wp version from hostgator. I need to delete it. But I don’t know what files or if I have to look through some code or what. I am just a hack (one who knows enough to get himself in trouble) like I am now. I was sold on good support here but it seems that part of wpmudev wouldn’t even let me submit a question. Maybe I don’t know enough and should stay away, but I sure would appreciate someone to help