I asked the question in the main forum and the answer was:
<p class="p1">Edit the home page in WP Admin, locate the page builder content block, edit the block. Locate the image and replace it. For more detailed response please create a topic in forums.</p>
<p class="p1">I can not find the "home page" to edit the image. I have the setup data working. Where is the home page to edit in ChildTheme 1. It is not under "Pages" in WP Admin, not in Appearance > Customize > background image, not in Appearance > Customize > Static Home Page (only assigns "front page" to "Home", not to edit it). I can not find the actual content to edit anywhere in my WP Admin panel. Where is it exactly please?</p>
<p class="p1">Also, can you give me a link to the pagebuilder documentation included in WPLMS?</p>
<p class="p1">I have a doc link to Visual composer but don't know which pagebuilder you have incorporated into WPLMS and the doc for it. Thanks for you help.</p>