I've scoured the forum and maybe I'm just blind. I understand what a meta tag is (I think)...but am I supposed to ADD them to each product where that little button is, you know, that little black and white button in the product line (under category).?

I'm not completely sure what to do with that button.

Does the site automatically pick up product description for the meta tags or do I add them? Is this the only way to get picked up by search engines?