Just visit this post and fill out the form. Then tweet @alexalovesbooks, or shoot an email to email@example.com, so you can be added to the official participant list.
For this challenge and giveaway you have to link up over at Alexa loves books. You must make a poem with the spines of books and it is up to you how creative you get! Make photographs, design it, write it down, paint it, it's all up to you.