Hello, I’m Nathan, and I’ll be assisting you today. My livelihood depends on your positive feedback, so your satisfaction is my highest priority.
Sorry to hear you’re having trouble, Karen.
You can touch on each item and then choose Remove, or Archive.
Also try looking in a different place on your kindle, where you should see a Home or Device library, and a separate Cloud library.
The cloud library is a collection of all the books you've ever purchased, which are stored on amazon servers, and available for you to download to the kindle again, but they aren't physically on your kindle device. Only the items in the device library are there.