On Android, to add a bookmark while reading a book, tap anywhere on the page and tap on the ‘Bookmark’ icon.
On iOS, tap on ‘Bookmarks’ and tap on the ‘+’ icon to add a bookmark. On iOS, you can also label your bookmarks for easy referencing.
On Android, tap the ‘Table of Contents’ icon, then tap the ‘Bookmarks’ tab. Hold down on the bookmark that you would like to delete and tap on ‘Remove bookmark’.
On iOS, select the book icon, then tap on the ‘Bookmarks’ tab. Tap on the ‘Edit’ button, select the created bookmark you want to remove and tap 'Delete'