Advice: for new post, you may describe your issue. If you tell us what is your problem, we can help you more easy. If possible, it would be nice if you could tell us what type of error this step says. So, You can learn a bit how the things works. It´s better for everybody!
Keep that in mind.
At least, you need to try the challenge. Or if you don´t know how to do it, you need to explain your issue.
Solution:
In this step, you don´t need to add anything. ONLY you must to replace the existing text inside the h1 (Hello World) by a new text (CatPhotoApp)