Using Viewer Modes
When you are ready to experience more in the virtual world, you may want to "graduate" to extended mode where more tools are available to you including how to create and build. This is accomplished by changing your viewer mode to extended mode in preferences.
Find preferences in the Me Menu or press Ctrl-P then click the modes button on the lower left. When you see the pulldown that says Simplified on the right side of the panel, change it to extended then restart the viewer.