Form action not working

I tried with User/add and it still doesn't work

maybe I should put some kind of helper?
pressing the button does not execute the form at all

subSECURE is = secure.domain.com
in routers.php

PHP Code:

function whichSubRoute()
{
 $subs = array("secure" => "secure/","api" => "api/");
 $curr = $_SERVER['HTTP_HOST'];
 $curr = explode('.', $curr);
 if (array_key_exists($curr[0], $subs)) {
 return array($curr[0], $subs[$curr[0]]);
 }
 return false;
}
$choiceRoute = whichSubRoute();
if ($choiceRoute !== false) {
 if ($choiceRoute[0] == "secure") {
 ...
$routes->match(['get', 'post'], 'User', 'User::index',['filter' => 'auth']);
 $routes->post('User/add', 'User::add',['filter' => 'auth']);

 }
 if ($choiceRoute[0] == "api") {
 }
} else {

$routes->get('/', 'Home::index');

}