Login into your MailChimp account. You will find "Audience" on the top navigation bar. Go to "Audience" page.
In Audience page, You will find your lists. Click on the "View Contacts" button of your preferred list (Where you want to save the emails from Dorik Subscription Form).
Inside your audience list, Go to "Signup forms" page.
In "Signup form" page, click on "Embedded forms".
In "Embedded forms" page, You will find "Copy/paste onto your site" box. Copy the form action URL as shown in the below image.
Paste the copied URL in "MailChimp Form Action URL" field in the Subscription Form element.