You are not supposed to create a new input element. Use the existing input element that you are initially provided on the code and remove the new one. And now nest that existing input element inside your form element.
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.