No form data sent to MailChimp with Addon

I've installed the MailChimp Addon and followed the instructions. I have the email being sent to a list in MailChimp but I have data that I would like sent across too. The documentation is quite vague. Has anyone managed to do this?

I have set up merge fields but unsure of how these work?

Thanks in advance.

Answered by Erin Dalzell!
>>>>>>> Answered <<<<<<<
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