Add a comment above the p element with this text:
TODO: Add link to cat photos
So to add a comment, the format you need looks like this:
<!-- put all the comments in the middle -->
They asked to add one comment.
The also asked that the comment contain the text provided:
TODO: Add link to cat photos
In your case you added this line:
<!-- TODO: Remove h1 --> TODO: Add link to cat photos <!-- TODO: Remove h1 -->
Do you think you followed the instruction to add one comment containing the text shown?
Hopefully I’ve now pointed you in the direction you need to go.