If you want to check to see if your book is included log out of your Amazon account, or access Amazon from a browser you rarely use and search the book. Why am I suggesting you do it this way? Because if you’ve bought the book or browsed it a lot from your account (as the author) it won’t show up.
Here is what it should look like, note red arrow:
Want to see other titles included? Head on over to Kindle Unlimited: https://www.amazon.com/Kindle-eBooks/b/ref=ARRAY%280xa57c7534%29?_encoding=UTF8&ie=UTF8&node=9578129011&pfShowFeatures=&ref_=amb_link_423111642_2&ref_=amb_link_423111642_2#
Per Amazon, if you want your title selected, here’s what they said:
To enroll your other books in Kindle Unlimited, you’ll need to meet the KDP Select eligibility requirements: https://kdp.amazon.com/help?topicId=A6KILDRNSCOBA#eligibility
So if your book is included will you get paid and if so, how?
From Amazon’s site:
The (KDP Select Global) fund amount is variable and announced on a monthly basis. We constantly monitor all factors that impact the KDP Select fund in order to set the fund amount for our KDP Select authors. You can earn your share of the KDP Select Global Fund amount when readers chose and read more than 10% of your book from Kindle Unlimited, or borrow your book from the Kindle Owners’ Lending Library.
So this means that readers must read 10% of your book in order to get paid from this fund. Also, the amount you get paid from this Fund varies from month to month.
Does this affect sales rank on Amazon? According to Amazon yes, it does.