title: Data.list error not picking up command?
body: <p><img src="https://i.stack.imgur.com/qoLJM.png" alt="error image"></p>
  
  <p>The code I am using keeps popping up with this error of not being able to find "change", how can I fix this problem? Is there something I need to download for it to work? Also, if needed, do I need to fix any other component of this for it to run smoothly?  I'm new to Haskell! </p>