To delete a cookbook from your Bookshelf you click the x on the right side of the search results (where the icons are). To delete recipes from Do-Laters and Favorites, click on those links in the left navigation pane, then click the x on the right side next to the recipe you want to remove. If you aren't sure about how to do something, our 'How to' section in Help explains most things. This one is the last question 'How do I delete a book/friend/menu?'