There are two areas in the main window:
“Objects” area, where you select objects to place on your playground.
An actual look of the application screen may change depending on a “playground” selected.
To drag an object, move the mouse pointer to the “objects” area and click on it. Then move it to the “playground” area and click again.
Size of the objects may change while dragging. Some of the oversized objects have been scaled down to feet into the “objects” area.
Once dropped in the “playground” area, an object can be moved. Just click on the object to select it, move it to the new place and click again to drop it. When you drop it, it goes on top of other objects that were partially hiding it. This trick is useful for getting the glasses and eyes placed correctly.