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add_action('admin_menu', 'register_my_custom_submenu_page2');

function register_my_custom_submenu_page2() {
	add_submenu_page( 'edit.php', 'Asignar usuarios', 'Asignar usuarios', 'read_private_pages', 'users', 'my_custom_submenu_page2_callback' );
}


function my_custom_submenu_page2_callback() {

?>	
<h1>Asignar usuarios</h1>
<form method="GET" action="#">
	<input type="hidden" name="asignar" value="true">
	<input type="submit" class="buttom" value="Asignar">
</form>
<?
	if(isset($_GET["asignar"])){

		die("asignando...");
	
	}
}