To place an item in your design, tap on one of the bubble icons, then on the Item of your choice from your Inventory or Store at the bottom of the screen. Your chosen Item will appear in the design. To replace this Item with another, simply choose a different Item from the Store. Your initial choice should be replaced with the new Item.

You can also remove an Item by tapping twice on the Item in your design, or by tapping the Item's Store image at the bottom of the screen.