You didn’t add an anchor. And anchor would have the form of <a></a>.
Looking more closely at your original code, I see this at the end of the line:
<a href="https://freecatphotoapp.com"</a>
That is basically an anchor, but is missing a closing angle bracket (>).
The job is to “Turn the image into a link by surrounding it with necessary element tags.” So, the image should be inside the anchor. I would expect it to have a format of: