To view the patterns that you attached to the objects you have to render the drawing.
To do this go to the Render menu by going to View > Render > Render.
This will bring up the Render window which allows you to select the conditions of the rendering.
For this lesson all that you need to do is make sure that the drop-down box at the top says "Photo Real".
Then click Render at the bottom of the window and the patterns will appear on the objects.
Notice that if you change views or even move your viewing window at all then the Rendering goes away and you will have to render the objects again.