How to Hide Print My Blog Admin Menus

function plt_hide_print_my_blog_menus() {
	//Hide "Print My Blog".
	remove_menu_page('print-my-blog-projects');
	//Hide "Print My Blog → Pro Print".
	remove_submenu_page('print-my-blog-projects', 'print-my-blog-projects');
	//Hide "Print My Blog → All Print Materials".
	remove_submenu_page('print-my-blog-projects', 'edit.php?post_type=pmb_content');
	//Hide "Print My Blog → Quick Print".
	remove_submenu_page('print-my-blog-projects', 'print-my-blog-now');
	//Hide "Print My Blog → Designs".
	remove_submenu_page('print-my-blog-projects', 'print-my-blog-designs');
	//Hide "Print My Blog → Settings".
	remove_submenu_page('print-my-blog-projects', 'print-my-blog-settings');
	//Hide "Print My Blog → Help".
	remove_submenu_page('print-my-blog-projects', 'print-my-blog-help');
	//Hide "Print My Blog → Upgrade".
	remove_submenu_page('print-my-blog-projects', 'print-my-blog-projects-pricing');
}

add_action('admin_menu', 'plt_hide_print_my_blog_menus', 1000000000);
Where do I put this code?