During the first boot after installing the package we will copy a partial view called NewsletterStudioSignup.cshtml
into the views-folder of the Umbraco-project.
This view can be used as a starting point for a simple signup form, you could use it in a block or render it directly on a page using something like this:
<partial name="NewsletterStudioSignup" />
This simple demo will just add the recipient to the first mailing list it can find. While this works just fine, the file is intended more as a starting point.
When you create your own signup form it's very likely that you need to use the INewsletterStudioService to add a recipient programmatically