!HELP! how do i delete books?

Im trying to tidy up my 'desk' on this site. i have a bunch of books that i started on here but i never ended up adding anything to them and i dont plan on doing anything with them for a long while. Is there any way to delete these books so they dont show up on my desk anymore?

Ive tried to google it or look for the Prose. user help but there doesn't seem to be anything that i can find.