How the electronic booklet tool works :
Click the plus or minus icon to add or remove a page from your booklet. You need to be on the page you want to add or remove when you do this.
Click the pdf basket icon to see a list all the pages you have added and select to print or download as a pdf booklet.
In the booklet / basket page you can rearrange your pages in to the order you want and remove anything you don't want.
Click download to save and / or print the booklet.