Go for Integration and click on Mailchimp, Mailchimp page will be open.

Enter MailChimp API Key in the Enter Mailchimp API Key input Fields and Click on Connect Button.

If Click on Connect button MailChimp is connected.

Go for Contact form Click on Setting icon.

Click on Form Settings and Go for Sends leads to MailChimp.

Click on Send Leads to Mailchimp radio button.

Select the option you want to select from the MailChimp list drop down.

Add Tag you want to add in the Enable tags Input Fields.

Select the option you want to select from the Enable groups drop down

If you add fields to the contact form , these fields will show up in the fields mapping and save the widget.

After save the widget check Mailchimp account Field is added or not.