Hello and welcome.
You need to add your code here. So we can help you more easy. Click the Ask for Help button located on the challenge (it looks like a question mark). This button only appears if you have tried to submit an answer at least three times.
You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.
See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (').
Solution: It seems, you missed the href value in the anchor of cat photos
Example of use the anchor:
<a href="HREF VALUE">link text</a>
Have a nice day. Grets.