It really helps to see all your code. When first asking a question use the ‘Ask For Help’ button which will create the topic in the correct forum, show your code, provide a link to the lesson and give you the chance to ask your question.
From what you’ve provided;
<form action="https://www.freecatphotoapp.com/submit-cat-photo"
is missing the closing >
We cannot tell what else is wrong without seeing all of your code.
When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.
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 (’).