If the settings are correct, a link will appear to the widgets page (Appearance > Widgets). Follow it.
Drag the Mad Mimi Signup Form widget to a sidebar, and configure the form.
If you want the form to be embedded in content, instead of shown in the sidebar, check the checkbox for "Do not display widget in sidebar", then follow the instructions for inserting the shortcode into your content where you would like the form to be displayed.
Requires: 3.2 or higher Compatible up to: 3.7.1 Last Updated: 2013-10-26 Downloads: 15,184