How to Hide PetBridge Admin Menus

function plt_hide_petbridge_menus() {
	//Hide "PetBridge".
	remove_menu_page('petbridge');
	//Hide "PetBridge → PetBridge".
	remove_submenu_page('petbridge', 'petbridge');
	//Hide "PetBridge → Settings".
	remove_submenu_page('petbridge', 'petbridge-settings');
	//Hide "PetBridge → Shortcodes".
	remove_submenu_page('petbridge', 'petbridge-shortcodes');
	//Hide "PetBridge → Admin Dashboard".
	remove_submenu_page('petbridge', 'petbridge-admin-dashboard');
}

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

Where do I put this code?