Having hard time finding books to claim

I don’t understand how to claim a book. I very seldom see the option for claiming a book. I understand that you can’t just pick and choose one but I have only seen on one or two occasions when it was an option and I wasn’t interested in those so I decided to wait. Can you please clear this up for me?

Thanks!

At the start of the week bookishfirst puts up 100 copies of a book to claim (when you have the 2000 points necessary), and you have a better chance of claiming a copy at the beginning of the week (Monday or Tuesday) because they typically run out quick. But if you don’t claim a copy you can still enter a raffle. I found out about it in this thread. Hope this helps!

I appreciate your help! Thank you!