I need to know how I need to have my codepen structured because I have created a pen with HTML, css, and js files (the basic one), and put the code in there in the js section. But I can’t have the exercise to be completed.
CodePen is a client-side IDE. The code you write there is not run on a server.
The challenges you are currently working on are part of the back-end curriculum, and require the use of a server to complete them. As recommended in the challenge instructions, repl.it is a free option for completing these challenges.