Lightwave is divided into two programs. In Lightwave, “Layout” (launched through a yellow icon) tools are found for animation, special effects, surfacing, lighting, and rendering. While Lightwave “Modeler” (launched through a greenish icon) does only one thing, modeling.
Please have a look in the upper left hand corner of the screen (as shown below). Note that there are many buttons with a tiny down-pointing arrow shape on them; these are “drop down lists”. In order for you to use them, you must hold down your left mouse button.