How to Hide the "RPS Include Content" Admin Menu

function plt_hide_rps_include_content_menus() {
	//Hide the "Settings → RPS Include Content" menu.
	remove_submenu_page('options-general.php', 'rps_include_content_options_page');
}

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

Where do I put this code?