1. To add a library item to Favorites, tap on the Star icon in the upper right of a document or folder thumbnail in your library and it will be added to the Favorites tab.
2. To bookmark a page, open the page and tap the Bookmark icon in the navigation bar. The current page can be found in the Favorites tab of the thumbnail view.
3. To remove an item from the Favorites tab of the library view, tap the Star or the Bookmark icon again.