Import a mardown library from github to the codepen project

Tell us what’s happening:
I cannot import the library. I only added the script tag and the link as the src but do not know how to use the library. couldn’t find any documentation of the library as well.

Your code so far

<!DOCTYPE html>
<html>
  <head>
    
  </head>
<body>
  <textarea id = "editor" type="text"></textarea>
  <p id="preview" >I change as the textarea changes<p>

</body>
<script src="https://cdn.freecodecamp.org/testable-projects-fcc/v1/bundle.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/marked/0.7.0/marked.js"></script>
</html>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.88 Safari/537.36.

Challenge: Build a Markdown Previewer

Link to the challenge:

I am still stuck at that point . here is my codepen link

I am unable to import the github flavored markdown and incorporate it with editor. I am stuck in the user story #4. Please click the link to see the user story
https://www.freecodecamp.org/learn/front-end-libraries/front-end-libraries-projects/build-a-markdown-previewer

I have acually solved it. Thank you for your replies.