Access your blog Layout > and click on the Add a Gadget > HTML/JavaScript > in the Sidebar or Footer sections.
Shortcode: {getMailchimp} $title={Gadget Title} $text={Gadget Text}
Gadget Attributes: The $title={}
and $text={}
attributes are optional.
Example:
You can get the link easily by following the steps below.
Create a free account on Mailchimp – Create Now
After creating your account go to Audience > Signup forms > Form builder.
Create and customize your form according to your needs.
Copy and access the Signup form URL.
After the page loads, Copy the final Subscribe Form URL into your browser’s address bar.
SUCCESS: Now you can correctly setup your subscription gadget.