It took more work than I anticipated. Everything in marketing online always does, so why was I surprised?
Anyway, I got the plugin on the sites linking the autoresponder. Got all the various groups, one group for each site set up. Got the forms done on the auto-responder.
Tested each site as each form was completed. By the fourth site, all four forms were showing up on all four sites.
AAAHH!!
Found out how to fix that. Now each site’s form is showing up just on its own website.
Later.