Your Zen Cart admin area presently lets you specify category-specific metatags, and product-specific metatags.
Other pages metatags are generally built from the list of category names on your site, along with descriptions gleaned from related content. If you've added some custom site-wide content to be added to your metatags via the file I mentioned earlier, that information will be added to them too.
Thus, you can control almost all the content simply by editing your category names, descriptions, and custom metatags, as well as your product names, descriptions, and custom metatags.
Anything else you want to customize metatags for can be handled by writing specific bespoke additional entries in the file I mentioned. That involves using FTP and a text-file editor.
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