First, you go to the presents screen, choose items, go to the item you want to delete, press B and then Press AYou will get a screen that says " trash?"press B and choose yes!
First, you have to highlight the book icon (next to the lights icon or the post icon) and select it. Then you have to go to "Present" and scroll through the items to find the one you want. Then once you found an item that you want to delete, press the B button. You will see a present and underneath it there is the word "wrap". Press the B button again and it will say "trash". Select "yes" and it's done!