Finding correct files to edit

[softshel]

If I use Filezilla to download files from my server what procedure do I use to find the correct file

Example - If I go to my website page and View Source I can see the HTML source code

I want to edit this but first I have to download the file from my server by using FTP through Filezilla

In Filezilla I can see the various directories/folders but what do I use to find/identify the correct file that corresponds to the specific HTML source code?

[boco]

The HTML filename should be in the browser's address bar. If no filename is displayed, try index.html, index.htm, default.html, ...