How do I delete a book?

1) At Shelf View, do a long press against a book cover icon. Anew menu will appear, scroll down and select the "Delete" icon.
2) At List View, tap on the "More" icon on the right of a book and then select the "Delete" icon.

For more help with your Aldiko library, please see http://aldiko.zendesk.com/home for additional help topics.