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Do you mean you are trying to connect your form to mailchimp and are unable to find the mailchimp api key to add to the integration?
I have tested the mailchimp integration and it is working properly on my end.
Which form are you having this issue on?
Please see https://www.jotform.com/help/163-How-to-Integrate-with-MailChimp to learn how to properly use and integrate your form with mailchimp.
If you need more help please explain to us more about the issue you are having so that we can assist you better.