The instructions want you to add an h2 element that has the text Cat Photos. You have not added an h2 element. You did attempt to create what appears to be an opening tag for a catphotos element, but there is no such element.
Well, first get rid of that <catphotos> because nothing in the instructions tells you to create that. Next, create an h2 element. You already know how to create an h1 element, so it is basically the same. Then, add the text Cat Photos to the h2 element.