1. Open a Buncee, and find the icons of the objects in the right sidebar of your canvas.
2. Press the icon of your object for about half a second to select it. Then, without releasing your finger, drag it up or down to change its layer on the canvas.
3. To move an object to the front, drag its icon to the top of the right sidebar (above all other objects). To move an object to the back, drag its icon to the bottom of the right sidebar (below all other objects).