Subscribers Names

I am using version 3 of the free version of Mailpoet. I have created a simple form within Mailpoet to add subscribers to my email list, which I intend to use for newsletter email distribution. The simple form was placed into the page which I have included in this request. The form does work, in part, because it does add new subscribers to my list, however, the first name and last name text does not transfer from the subscribe form into the subscriber’s data in the plugin. So when I look at the subscriber’s list, from the dashboard of the plugin, I only see the email address of the new subscriber, not the first and last names that were keyed in when the subscribe form was completed and submitted. What am I doing wrong here? If a Mailpoet form includes fields for the first name and the last name, how does the text from those fields get inserted into the subscriber’s list in the plugin, along with the email address?

The page I need help with: [log in to see the link]