Unable to use codepen.io

I have just forked this project and after that i am unable to use codepen.io. It only is showing the end output but i am unable to edit anything with it…
please someone help me on this.
Also if i want to run the test cases on my local environment then i just have written this code but all i am getting with this is a hamburger icon with no tests involved. so how can i actually test my code with the provided tests??

3 posts were merged into an existing topic: Codepen not working