How to Hide bbPress Admin Menus

function plt_hide_bbpress_menus() {
	//Hide "Tools → Forums".
	remove_submenu_page('tools.php', 'bbp-repair');
	//Hide "Settings → Forums".
	remove_submenu_page('options-general.php', 'bbpress');

	//Hide "Forums".
	remove_menu_page('edit.php?post_type=forum');
	//Hide "Forums → All Forums".
	remove_submenu_page('edit.php?post_type=forum', 'edit.php?post_type=forum');
	//Hide "Forums → Add New".
	remove_submenu_page('edit.php?post_type=forum', 'post-new.php?post_type=forum');

	//Hide "Topics".
	remove_menu_page('edit.php?post_type=topic');
	//Hide "Topics → All Topics".
	remove_submenu_page('edit.php?post_type=topic', 'edit.php?post_type=topic');
	//Hide "Topics → Add New".
	remove_submenu_page('edit.php?post_type=topic', 'post-new.php?post_type=topic');
	//Hide "Topics → Topic Tags".
	remove_submenu_page('edit.php?post_type=topic', 'edit-tags.php?taxonomy=topic-tag&post_type=topic');

	//Hide "Replies".
	remove_menu_page('edit.php?post_type=reply');
	//Hide "Replies → All Replies".
	remove_submenu_page('edit.php?post_type=reply', 'edit.php?post_type=reply');
	//Hide "Replies → Add New".
	remove_submenu_page('edit.php?post_type=reply', 'post-new.php?post_type=reply');
}

add_action('admin_menu', 'plt_hide_bbpress_menus', 11);
Where do I put this code?