I liked it until it got full of books I purchased

I liked it until it got full of books I purchased. Now I can't find or not understanding, instructions on how to delete current books and then get the .new ones from archive storage to where I can read them. VERY Frustrated. Have wasted lots of time trying to find instructions on how to do this. Am having to add new books to old Kindle that I can operate. If I can get that under control, it'd be a five star. Prefer not to post publicly this post .

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