We've created this Forum Thread with some workarounds and advice to assist you in publishing you ebook.
Please forgive my naivety, but this is the first time I have tried to create a book on Lulu.com. I am wanting to make a "how to" photography book and I am a bit confused about how to use the square template that I download. Do I actually write my book in that template and delete the text that is in it? No fair laughing at me - everyone has to start somewhere! LOL