OK. Nothing to worry about here. The wording above the line you asked about is telling you how to edit main block of text on this page. This line is just telling you where in the system it is located.
Zen Cart has quite complex and deep directory/folder structures. So if the directory in which you have placed your shop as being called mystore, then this file would be located located several levels down in
mystore > includes > languages > english > html_includes > classic > define_page_3.php
However, you can ignore this and edit the text directly from the Admin system. I think that yiu may have already done this on your homepage. But in case not ...
Enter https://www.thefancifulfanny.com/admin into your browser (or click on the link) and then log in.
Choose Define Pages Editor from towards the boittom of the Tools menu.
Then choose define_page_3.php as the file to edit from the drop down menu.
One side comment though. You are using the classic template. I strongly recommend against this for new sites, and especially for new users. Here is an explanation of why and a link to a step-by-step guide to a better approach.
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(Questions answered in the forum only - so that any forum member can benefit - not by personal message)