How to set the MailChimp plugin

Freyja theme uses the MailChimp plugin to create the form Subscribe to my newsletter.

<div class="subscribe2-box">
  
<div class="sas-wrap-s sas-textaligncenter">
	<h3>Sign up for Newsletter
</h3>
	<p class="body2">Sign up for my weekly newsletter to receive offers and creative ideas!</p>
</div>
	<div class="sas-wrap-s flex-column">
  
      <div class="flex-col3 ">
          <input type="text" name="FNAME" placeholder="Name">
      </div>
      <div class="flex-col3 ">       
          <input type="email" name="EMAIL" placeholder="Email" required />
      </div>
      <div class="flex-col3 flex-colm-100">
          <input type="submit" value="Subscribe" />
      </div>
      
	</div>
</div>