Watch carefully the structure, the syntax and now watch your code:
<form action="https://www.freecatphotoapp.com/submit-cat-photo"
<a href="#"><img src="https://cdn.freecodecamp.org/curriculum/cat-photo-app/relaxing-cat.jpg" alt="A cute orange cat lying on its back."></a>
<!-- I removed the middle part for that it be easier to analyse -->
<input type="text" placeholder="cat photo URL">
Do you see the differences between your code and the example gave by the course?
Hint: do you have an opening and closing form tag with the good syntax?
Advices:
Watch the log message you have in the console to help you debug your code. The message is: Your form element should have well-formed open and close tags.
Indent your code well, like this you can see the things missing faster.