You attempted to add an anchor element to the HTML when the instructions did not ask you to. Is there a reason you did this? You should only do exactly what the instructions ask and no more. Changing anything else will most likely cause the tests to fail.
I would restart the step to get the original HTML back. Then, the only thing you want to do is add the comment above the p element. The text of the comment should be TODO: Add link to cat photos.