Having trouble finding the index.php page in my FTP

Hello,

I am trying to install this Google Product Feed module:

http://www.opencart.com/index.php?route ... on_id=2500

Following these instructions (using vqmod)

1. vQmod XML file (recommended)

This is the best way to install as it is non destructive to the core files.

If you do not already have vQmod installed, you can get it from http://www.vqmod.com

Warning - vQmod should ony be installed on stores that have not already been modified (apart from obvious template files and stylesheets).

Simply copy the two xml files 'uksb_google_merchant.xml' and 'uksb_sitemaps.xml' from the vQmod folder to your vQmod/xml folder.

Also, you must edit index.php

Find:

if (isset($session->data['language']) && array_key_exists($session->data['language'], $languages) && $languages[$session->data['language']]['status']) {
$code = $session->data['language'];
} elseif (isset($request->cookie['language']) && array_key_exists($request->cookie['language'], $languages) && $languages[$request->cookie['language']]['status']) {

Change To:

if (isset($request->get['language']) && array_key_exists($request->get['language'], $languages) && $languages[$request->get['language']]['status']) {
$code = $request->get['language'];
} elseif (isset($session->data['language']) && array_key_exists($session->data['language'], $languages)) {
$code = $session->data['language'];
} elseif (isset($request->cookie['language']) && array_key_exists($request->cookie['language'], $languages)) {

The index.php editing part I am having trouble with. Where is the index.php? Is it in my FTP? Is it somewhere else? What exactly is it?

Straightforward and hopefully easy question to answer!

Thank you,

Flying City

Via FTP: