To find the menu options in DL Reader app for Windows 8, or in WinRT on a Windows tablet like the Microsoft Surface, you can right click anywhere in the bookshelf view. If working on a Windows tablet, swipe from the top of the screen down to display the menu options. This will reveal options along the borders of the application, not just the top border. On the top border, options relevant to the bookshelf including sorting options will be made available. The top border also holds the option to add a file to the bookshelf.
If you swipe from right to left, an options ribbon would appear on the right side of the screen. Clicking on the "Settings" menu item will reveal the activation option.
If you select a book in the bookshelf view, to find menu options, right-click or swipe from the top of the screen down if on a WinRT tablet. On the bookshelf, the bottom border will be populated with the options to delete the book or check the metadata.
Highlights, notes and bookmarks are not supported in the WinRT version of the reader.
To delete a book on a Windows 7 device, right click on the book. A pop-up menu appears. Select "Remove from library."