Once you have associated an image to a 3D object you will need to unwrap the facets of the 3D object into 2D parts that can be arranged on the image. This will allow you to 'map' which part of the image is to appear on each facet.
You can individually select facets on the 3D object, or select all of the facets.
To selcect an individual facet, click on the blue node of that facet. To select multiple individual facets, hold down the shift key and then click on each facet's blue node.
To select all of the facets drag a selection rectagle around the entire 3D object.
At this point you will want to begin arraging the 2D parts. There are two complementory methods to do this: Packing and Editing.
Packing 2D Parts
Editing 2D Parts