Click on Create Link and select Mail signup option

Add the name of the form and click Submit

Click on the three dots at the right and click "Edit"

Scroll to the bottom, and find the "Mailchimp API Key" and "Mailchimp List"

Log-in to your existing Mailchimp Account, click on your logo and click on "Account"

Click on the "Extras" dropdown and select "API Keys"

Click on "Create a Key"

Copy your API key, which should look like below

Go back to your biolinc page and paste the API key to your "Maichimp API key" box

Next, let's add the last component, which is the Mailchimp List ID. This list ID is used to add your customer email to your desired Mailchimp list. Usually, free Mailchimp accounts allow for only 1 list, but if you have a premium account, you can have multiple.
Go back to your Mailchimp account and click on "Audience"

Then click on "Manage Audience" and then "Settings"

Scroll to the bottom of the page and copy the "Unique ID for audience"

Paste that "Unique ID" to your biolinc "Mailchimp List" box and press "Update"