Change Your API Key or Username in Mailchimp

How to update your Mailchimp API key or username.

• Navigate to the  Icon in the top right corner of your account and select Account Settings.

• Scroll down to Integrations.
• Under Mailchimp, click Configure.

• A pop-up will appear showing your firm's current Username and API key. 
• Enter your firm's new Mailchimp Username or new API key copied from Mailchimp.
• Click Save.

• Now manage the client's MailChimp Lists.