add something to database code

can someone help me fix this code?

<?php
/*
Plugin Name: test
Description: testing
Version: 1.0.2
*/
if ( is_admin() ){
	add_action('admin_menu', 'kn_mp3_admin_menu');
		function kn_mp3_admin_menu() {
			add_menu_page('Search', 'Search', 'administrator', 'kn_mp3', 'kn_mp3_html_page', WP_PLUGIN_URL.'/'.str_replace(basename( __FILE__),"",plugin_basename(__FILE__)).'images/kaki.png');
			}
}
function kn_mp3_html_page() {
?>
<form method="post">
	<input type="text" size="100" name="text" value="<? echo get_option('text'); ?>" />
	<p class="submit"><input type="submit" class="button-primary" value="<?php _e('Save Changes') ?>" /></p></td>
</form>
<?php
}
?>
<?php
global $kn_mp3;
$kn_mp3 = "1.0.2";
//install database kn mp3
function kn_mp3_install() {
   global $wpdb;
   global $kn_mp3;

   $table_name = $wpdb->prefix . "kn_mp3";

   $sql = "CREATE TABLE " . $table_name . " (
	  id mediumint(9) NOT NULL AUTO_INCREMENT,
	  time datetime DEFAULT '0000-00-00 00:00:00' NOT NULL,
	  name tinytext NOT NULL,
	  text text NOT NULL,
	  url VARCHAR(55) DEFAULT '' NOT NULL,
	  UNIQUE KEY id (id)
    );";

   require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
   dbDelta($sql);

   add_option("kn_mp3", $kn_mp3);
}

register_activation_hook(__FILE__,'kn_mp3_install');
?>

I try to make submit button works.. save the date to the database that created..

admin page : wp-admin/admin.php?page=kn_mp3