I finally got tired of not being able to figure out how to adjust these shades and contacted the manufacturer, Irvine Shade & Door, Inc. Their web site had absolutely no information on this product. I emailed a couple of their people and got a response from one. She sent me the following scan of their adjustment instructions which I thought others might like to see.
By the way, I was told they have hired someone to update their web site
Irvine Shade And Door.