When you submit your book, your submission becomes locked and you’ll be unable to edit it further.
If you need to edit your submission while it’s still under review, you need to select the withdraw button in the Submissions Manager section of your account to take the book out of the review process.
Once you withdraw your book, you’ll be able to edit your submission again. When you’ve made all necessary changes, you’ll need to continue to the end of the submission process and confirm that you’re resubmitting your comic.
After this, your comic’s status should be listed as “Submitted” in your Submissions Manager list, and it will be placed under review again.