The Control Screen 

                                                   Using Image A

Find the Image "A" Selector, located on the upper right of your screen. As you 
click up or down on the arrows, the selected image's title will appear in the
text window. This is the source image you will manipulate and view on your 
monitor. Now that you have selected a source image, you can change its 
orientation by clicking on the Rotation Control Arrows (bottom right of 
screen). Image "A" will be rendered according to the rotation setting you 
choose (North, South, East, or West).  North is the default setting.

                                             Combining with Image "B"

Image "A" is always active, but you can toggle Image "B" on or off. Use the 
Image "B" Selector to choose an image. When you activate the "B/On" Button,
the chosen Image "B" title will be blended  with the image you have selected
for Image "A." Note that while Image "A" is affected by the rotation control, 
Image "B" is always set to normal orientation. Try selecting the same image 
title for both "A" and "B", rotating "A" 180 degrees (South) and rendering the
result. Also, try exploring Image "A" by itself!