@Becca - there are no "tags" as such on books for collections for Kindles. There is just a json index file stored in the Kindle which keeps track of what books are in each collection. You can manually edit collections that you are maintaining on your Kindle using the "Edit Collections" feature of this plugin on the dropdown menu. Alternatively you can generate your collections on the Kindle from calibre using metadata from your library (like by author or tags). And some users use a feature allowing the collections to come from a custom column they setup, so changiing a collection for a book is a matter of changing the value in that column and then running the plugin's "Create collections" feature again.
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