How to Hide ScoutDocs Admin Menus

function plt_hide_scoutdocs_menus() {
	//Hide the "Settings → ScoutDocs" menu.
	remove_submenu_page('options-general.php', 'scoutdocs');
	//Hide the "ScoutDocs" menu.
	remove_menu_page('scoutdocs-list');
}

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

Where do I put this code?