How do I select a vertex in edit mode I've imported an stl into blender, and I'm trying to create morph targets. For some reason, when I go into edit mode, I can't select the vertex. When I click the window it just moves the crosshair with a circle thing aroud, but does not actually select a vertex. What am I doing wrong ?
You're left-clicking.  Blender uses Right-Click to select. if you don't like this, you can change it in your user preferences (Ctrl+Alt+U), though there are some advantages to just getting used to it so you can follow what everyone else is doing with Blender.