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Go to https://www.filezilla.com, and download the installation file for your OS (Windows, Mac or Linux).
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Install FileZilla on your computer.
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Run FileZilla. Near the top, there is an area that has 4 boxes. In the first, labelled 'Host', enter the name of your site (ex. 'mysite.com').
In the next box, labelled 'Username', enter your user name for your site (usually the same user name you would enter to access your control panel).
In the third box, labelled 'Password', enter your site's password (again, probably the same as your control panel).
- Click on the 'Quickconnect' button.
If everything is correct, Filezilla will connect to your website.
The area below the login boxes just shows you what Filezilla and the server are saying to each other. Unless there's a problem, you can ignore that.
Below that, on the left, labelled 'Local site' is your local computer's directory tree (same stuff you see in Windows Explorer). On the right, labelled 'Remote site' is your website's directory tree.
In the top box on the right, there will usually be a folder with a + to the left of it. Click the + to expand the tree. One of the folders below will, in most cases, be public_html. This is your 'root' directory. If your site goes right to your Zencart store, the files will be here. Clicking on public_html in the top right box will display the folders inside it in the bottom right box.
Most of the files you'll be editing will be somwhere inside the includes folder. Double click that folder to see the files and folders inside it.
Find the file you want to modify, and drag it from the right box to wherever you want it on your local computer (I have a special folder on the desktop I use for that).
Open the file, using a good text editor (I use Notepad ++ - free and easy to use), make your changes, save the file to your local computer, and then drag it back to the proper override folder. You do have override folders, right?
All pretty easy, once you've done it a little.