This documentation is not using the current rendering mechanism and will be deleted by December 31st, 2020. The extension maintainer should switch to the new system. Details on how to use the rendering mechanism can be found here.
This extension can be installed like any regular TYPO3 extension:
- Use the Extension Manager to download the extension
- Use composer to require the package
After the login at http://www.mailchimp.com switch to Profile > Extras > API keys. Press the button Create API key and save the key for later.
After activating the extension in the Extension Manager, you need to provide the key in the settings.