Help with code for Mailchimp fields on Contact Form 7

Hi Guys

I am a bit of a noob when it comes to WordPress and need some help. I have figured out how to add the checkbox, and i have assigned the checkbox to my mailchimp list. But i am only pulling in email and last name to my Mailchimp list. I think i need to assign the fields on the form with fields in Mailchimp to be able to grab first name and phone but that is where i am getting lost.

Could someone please help guide me as to what i should add to the code for Contact Form 7. This is what i have right now:

<p>First Name (required)
[text* your-name akismet:author] </p>

<p>Last Name
[text* lastname] </p>

<p>Your Phone Number
[text your-phone]</p>

<p>Your Email
[email your-email akismet:author_email] </p>

<p>Your Suburb
[text suburb] </p>

<p>Subject
[text your-subject] </p>

<p>Tell us about your event
[textarea your-message] </p>

<p>[mc4wp_checkbox “Yes, email me new promotions & menu’s”]</p>

<p>[submit “Send”]</p>

My fields in Mailchimp that i want to populate are:
First Name – FNAME
Phone – MMERGE3

Thanks all!

https://wordpress.org/plugins/contact-form-7-mailchimp-extension/