Gloriamarie:
Allow me to try to answer your questions:
1) [Caveat: I'm neither a Mac nor Kindle user, so this info may be slightly off...] When you tell Calibre that you want to add a book, Calibre opens a dialog box to let you find the file on your computer that you want to add to Calibre. I suspect that you were expecting Calibre to load the book from Amazon, but that isn't how the system works. You need to download the book from Amazon to your computer (usually via Amazon's desktop application) and then add that file to Calibre. Thus, you need to know where on your computer the Kindle app stores books. I'll let a Mac user give you guidance with that.
2) Tags are simply a way to help people organize their libraries. For example, in my library I use the tags "non-fiction" for non-fiction books (obviously), "kids" for books that are intended for my kids, "cookbooks" (obvious, again), and other similar tags. Some people might tag their books with "thriller", "mystery", "science fiction" or the like. Tags can be whatever you want them to be; they are intended to help you organize your books and find what you're looking for.
Hope that helps a bit.
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