To begin, create a toolbar object under DefaultPicture that will contain our icon buttons. We add one button: the Done button:

1. With DefaultPicture selected in Hierarchy, click Create Empty and name it Toolbar.
2. Set its Position to (0, 0.4, -0.1) so that it's near the top of the picture and a little in front.
3. From Assets/SimpleIcons/Prefabs/ drag the DoneButton prefab into Hierarchy as a child of Toolbar
4. Set its Position X to 0.45, placing it in the upper right of the picture.

If you are not using the SimpleIcons package we provided, you can just add a cube with the scale (0.1, 0.1, 0.04), and name it DoneButton.