Note: Before you start this step, you need to have a pre-existing account with MailChimp.
In MailChimp, go to the account name panel on the top right and click on it. Then click on Account in the menu that appears.
Inside the MailChimp account screen, click on extras and then on API keys.
In the API Keys area, scroll down to 'Your API Keys' and then click on the 'Create a Key' button.
This will generate a key for use with Unify Enterprise. Copy this key in a safe place and do not give it to anyone.
You then need the Account name. For this simply click on Settings and then on details. Copy this account name and keep it safely along with the API Key.