Enable copy and paste in a webpage from the browser console

force-ctrl-c-v.md

javascript:(function(){
  allowCopyAndPaste = function(e){
  e.stopImmediatePropagation();
  return true;
  };
  document.addEventListener('copy', allowCopyAndPaste, true);
  document.addEventListener('paste', allowCopyAndPaste, true);
  document.addEventListener('onpaste', allowCopyAndPaste, true);
})(); 

How do I add this code to a website. (I am no professional coder. I just want to copy and paste from Mcgraw Hill.