[soulfuldog]

You'll see when you have Calibre running that one of the buttons along the top is for 'Edit metadata'. If you highlight one of your books in the main window and then click on the Edit metadata button, it opens up a new window showing the metadata (cover, title, author, tags, synopsis etc) of that book. Quite often there is nothing other than the title & author fields filled in, so you can then click the 'Download metadata' button and it'll search Amazon, Google, Goodreads etc for the relevant information.

Rather than going through each book individually, I normally do it for maybe 10 books at a time by first highlighting them, then I click the arrow to the right of the 'Edit metadata' button and choose 'download metadata and covers' and take it from there.

Once you've updated the information Calibre stores as metadata, just do as described above. You need to do the conversion from mobi to mobi to get the updated metadata displayed in your books.

It can be time consuming and it's worth having a play about with it doing one book at a time until you figure out what the different options are. It's fairly straight forward once you get the hang of it and it's definitely worth the effort to get the relevant book information when you open up another book on your Kindle.