To connect Mailchimp to your website you need to go to Website/Funnel Settings and select Applications. After that click on Add Application.
Then click on Connect for Mailchimp integration
Next Step: Get your Mailchimp API Key
If you don't know your Mailchimp API Key follow these steps:
1) Login to Mailchimp and on the top-right click on your profile and click on Account.
2) Click on Extras and then API Keys.
3) Copy the API Key and enter it in your Mailchimp popup in the builder and click on Save and Verify.
Once connected, every form, member or store will have the option to send the client information to Mailchimp for your email marketing campaigns.
How to send the inputs from a form to your Mailchimp lists.
Click on a Form Widget and then on the Settings Icon.
When Mailchimp is connected, there will be a Mailchimp Settings button to click on that will show all your lists in your Mailchimp account => Then select the list you want to send the form information to.
How To Send All Form Submissions To Fields In Your Mailchimp Lists:
1) Go to your Mailchimp -> Lists and select the list you want to send data & form submissions to. In settings click on: List fields and *|MERGE|* tags.
2) You will then see the currently existing fields. To add more fields, click on Add A Field. You will see that there's a field to add a tag name. You can copy in this case MERGE2 and paste it into the settings of the field that you want to send the data/form submissions from.
This way, all the inputs of a certain type (ex: First Name, Last Name, Email, Phone, etc.) from submissions can be sent to your Mailchimp list where the respective fields are in line with what someone submitted from your website/funnel.