Good point. The issue is that a list can be embedded in multiple pages and when you generate HTML, we can't quite guess the URLs. So it's going to need a slightly complicated solution.
One option is to provide an HTML generator right within the Listly WordPress plugin - you pick a page, we look at the list that's embedded and generate HTML for you. Maybe we can even integrate with a tool like MailChimp with a "send list to MailChimp" feature. There might even be an integration with Zapier or IFTTT that allows us to send to any email marketing tool.
The other way to do this is when you generate HTML on Listly, you pick one of the embed locations and we can generate the links for you...