Hey Myra,
Thanks so much for your clues. I did some reading and then went back to Adobe Color. I figured out that extractions could be made only on JPGs, right? Then I went to Explore and entered a jpg of a seascape that I liked, not knowing what would happen next. I stopped at Page 11, but I saw MANY seascapes resembling what I had entered, together with color themes. I downloaded a few themes. Now I am at a wall. How do I apply a theme to my jpg, see the color wheel where I can make some adjustments to the theme (can't I?), see my image with the new colors, and bring the image back to LR for final adjustments? There must be a way to do these things, but I can't find enough clues to put me on the right track.
If you can answer these Qs, I'll buy you lunch the next time I see you. Thanks again for everything.