My connecting URL form in html to PHP does not work

I suspect the cause of your problems is here:

$video = $_POST['subject'];
if ($video == true){

For example, if our subject is https://www.youtube.com/watch?v=dQw4w9WgXcQ then the check is:

if ( 'https://www.youtube.com/watch?v=dQw4w9WgXcQ' == true )

And we know that true is not https://www.youtube.com/watch?v=dQw4w9WgXcQ, so the check here is incorrect. What we want is to check if $video contains something other than an empty value:

if ( ! empty( $video ) ) {

I would also recommend placing the form handler code before the form, not afterwards, and using escaping functions on the output. Right now someone could put a script tag in the input box and execute arbitrary javascript on the site

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