How to Hide PDF Generator For WP Admin Menus

function plt_hide_pdf_generator_for_wp_menus() {
	//Hide the "WP Swings" menu.
	remove_menu_page('wps-plugins');
	//Hide the "WP Swings → Home" menu.
	remove_submenu_page('wps-plugins', 'home');
	//Hide the "WP Swings → PDF Generator For WP" menu.
	remove_submenu_page('wps-plugins', 'pdf_generator_for_wp_menu');
}

add_action('admin_menu', 'plt_hide_pdf_generator_for_wp_menus', 51);

Where do I put this code?