Hi flyfishergirl,
Perhaps you can try consulting your webhosting provider to set up SSL on your site so that this error message does not appear?

The ssl is set up, the problem is, that members post off site photos which is creating an error. and the plug in is auto posting from the site without the https: from jreviews. listings

Hey there,
Unfortunately, there's no perfect way to achieve this. If you convert those user uploaded content(eg. photo images) http links to https, it may prevent the error message from displaying, but in turn certain images may not be accessible/broken links once their url is changed.
If you really want to convert all permalinks to https, you can contact Admin tools developers regarding this and see whether this setting is it still available in latest version
https://www.akeebabackup.com/documentation/admin-tools/ch02s14.html