Press right mouse button to select an interaction mode from the popup menu, or use keyboard keys to temporarily switch between different modes. Some essential modes are:

o    Rotate surface (this Orbit mode is the default mode)
s    Scale surface, drag in vertical direction
t    Translate surface in viewing plane
r    Reset camera and display, object returns to default position
Right-Mouse    Show control window
Help    With all keyboard shortcuts, and help on problems.