If you go into Amazon.com, you go to "Your Digital items" in the upper right corner, and then "manage your kindle." There is no direct loan option that I know about, but there is the option to download the file and transfer it via USB. Theoretically, I think you can e-mail those files to the person you want to share the book with, and they can upload it to their kindle.
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Re: Hey all you Kindle users.....
Here is the help page of how to do it. Hope it helps
https://www.amazon.com/gp/help/customer/display.html/ref=hp_200549320_loan?nodeId=200549320&#loan
OMG I didn't even know you could share books, I'm obviously a kindle novice, only had it a month but I love that thing!
*Runs off to ask everyone if they have the books I want to read*