If you wish to add users to a mailchimp mailing list using a form on your site you can do so by adding a form to any page on your site, or using our "Pop Up" feature. 

To integrate Mailchimp

  1. Add a Form to any page of your site or add a Pop Up form 
  2. Click on Send to "edit"
  3.  Choose 'add user to a mailing list' from the drop down menu 
  4.  Click on 'Configure'
  5.  On 'settings' click on 'Setup' 
  6. Choose Mailchimp from the drop down list and add your username and API key.

See their article below to find it - http://kb.mailchimp.com/integrations/api-integrations/about-api-keys

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