you can place the radio buttons just before the submit button.
<form action="https://www.freecatphotoapp.com/submit-cat-photo">
<input type="text" placeholder="cat photo URL" required>
RADIO BUTTONS GO HERE
<button type="submit">Submit</button>
</form>
Also, I noticed you were trying to post come code in your last reply but was unsure how and edited your response.
here is how to write code in the forum.
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 (’).