As far as Zen Cart is involved, changes take effect immediately when the file is uploaded.
So, when you use your FTP program to upload the edited file, it is immediately available for subsequent visits.
If you are not seeing the changes, then the file's contents have probably been cached by your browser. Clear your browser's cache to cause a reload. You might be able to trigger a reload by pressing F5 when looking at the page, or right-clicking and choosing "Refresh" or "Reload" depending on your browser. But emptying the cache is most effective.
Using your browser's "Inspect" functionality can help further as well. Firebug takes it up another level too. You can find discussions of these web designer tools all over the internet.


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