Thanks for responding. I always try things out several times and in several different ways before posting. Here's the problem:
If I leave the default link for the image, then clicking on the image brings it up in a lightbox. Now when I try to add a page link where the default image link appears, it just doesn't work. Clicking on the image brings up a box that says "Image cannot be loaded. Make sure the path is correct and the image exists."
I've tried setting the link to open in a new window, as I read that is necessary for the page link, but still the same error message appears.
Ultimately I want to link the image to a lightbox contact form, but I'd settle now for knowing just how to link it to a page! What am I doing wrong?