How to Hide PWA for WP - Progressive Web Apps Made Simple Admin Menus

function plt_hide_pwa_for_wp_menus() {
	//Hide the "PWA" menu.
	remove_menu_page('pwaforwp');
	//Hide the "PWA → Settings" menu.
	remove_submenu_page('pwaforwp', 'pwaforwp');
	//Hide the "PWA → Upgrade To Premium" menu.
	remove_submenu_page('pwaforwp', 'javasctipt:void(0);');
}

add_action('admin_menu', 'plt_hide_pwa_for_wp_menus', 11);

Where do I put this code?