I have PSE on a 30-day trial. I have been doing some editing much of the day with Brush, Erase, Text, etc. However, I cannot seem to to utilize Clone Stamp. When I try to select a region to clone, I always get an error message "Could not use Clone Stamp because the area to clone has not been defined" After I select the tool, the cursor switches to a brush-type so I believe that I am in the right mode, it just won't allow me to select a region of the pic to "Clone" I am in Full Edit mode (vs, Quick or Guided) and can utilize the other tools just fine. I am sure this is "Operator Error". Can someone please tell me what I am doing wrong?