To integrate with Mailchimp, simply follow the steps below.
1. Go to "My Account > Autoresponders > Connect New Autoresponder" in your OL account.
2. Select Mailchimp from the drop-down menu for Autoresponder System.
3. Open a new browser and login to your Mailchimp account.
4. At the top of the navigation bar in your Mailchimp dashboard, click on your profile icon or name of your account. Then, select "Account"
5. Click on "Extras" on the account page, then select API Keys.
6. Create a New Key. Copy the "API Keys" and paste it in the API Key section within OptinLabs.