Go to the book icon (9th one), then go to PRESENTS, pick a item by pressing the B button, then it should say WRAP?, Press A, and it should say TRASH? Then press the B button to delete it.
it depends on what you need to delete off of your tama. if its items or food go down to the book icon and hit it. then go to present thing and select it. select what you want to delete food or item. then go to the exact thing that you want to delete. select t and then it will say wrap? hit the A button nd it will say trash. select it and it will say sure? select yes.