Popups must be enabled in order to publish books. If popups are disabled, you will see a message letting you know to enable them when you first open the writing tool.
Before publishing your book, you must first save it. This can be done from the drop down menu under My Books in the top left of the menu bar, or by clicking the save icon.
Next, click on Publish and Submit Book to Teacher Account
A box will pop up asking if you would like to preview the book. Choose no. (If you would like to preview the book, you can choose yes; You will just need to go back to Publish > Submit Book to Teacher Account and choose no the second time).
You will be brought to a new page where you will be asked to confirm that you want to submit the book to your teacher. Click the Submit button. If you have more than one teacher, you will be given the option to choose which teacher to submit your book to.