E-Books that you checked out will be listed under the My Books tab. Books you have already downloaded will have a Read or Return button. If you borrowed the e-book from another device or checked the book out from another application or from the web, it should be in your My Books tab. If not, sync your device book shelf by dragging the list downwards. Then tap the download button.
In the event of connectivity problems, books may fail to download. Try downloading again when you have a strong connection. If you borrowed a book on another device, and it is not in your My Books Tab, follow the instructions above to sync your bookshelf.
Be aware that e-books downloaded outside of SimplyE (to a computer or different reading app) might not be available to download in SimplyE.