Meta Tags are HTML elements which are designed for web browsers and search engines - they’re not designed to be looked at by humans.
Meta Tag information in your pages is constructed by Zen Cart using the information from the screens below, as well as the contents of the file
How can I add Meta Tags to my categories?
Use the Categories Meta Tags Editor.
How can I add Meta Tags to my products?
Use the Products Meta Tags Editor.
How can I add Meta Tags to my EZ-Pages?
Use the EZ-Pages Meta Tag Fields plugin.
How do I determine what meta data goes on the product info page?
The screen Admin > Configuration > Product Info has a series of fields that allow you to fine tune the meta tag data on the product info page.