You can tweak and edit your book as much as you like. The title, author name, and size will be locked once you get those set, but the rest of it can be tweaked as much as you wish. You can load and reload the content. The cover. Tweak the price. Change the description and author bio. Keep playing.
Keep "Saving Progress" as you go, to save what you have. You can log out and log in a week later to work on it some more.
When you are finally ready for CreateSpace to take a look at it, you want to click the "Submit for Review" in the lower right.
This process normally takes 1-2 days. Be patient. They'll get to it soon.
Usually they say it's good to go. You can then order a proof copy or just review an online version of the proof. Either way you can keep reloading and rechecking as much as you want. You can order a proof copy, revise it, order another proof copy, revise it, and so on, for months on end. There's no rush.
You decide when you are finally satisfied with it and ready to put it live.
Amazon Paperback Self Publishing Step by Step - main page
Amazon Paperback Self Publishing
Loading Up the Amazon Paperback Book
Making a Amazon Paperback Cover
Amazon Paperback Proof Copy vs Author Copy
Channels and Pricing on Amazon Paperback
Review Process on Amazon Paperback
Timing of Amazon Paperback Process
Problems and Issues with Amazon Paperback
What Does It Cost to Ghostwrite a Book?
Lisa Shea's Editing Services
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Lisa Shea Full Library of Published Books
Getting Your Book Published
Writing Tips and Online Books
Lisa Shea Medieval Romance Novels
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Lisa Shea Website Main Page