Set Up MailChimp
1. MailChimp API
The API key for connecting with your MailChimp account. Get your API key here.
2. Form
<div class="mail-style1">
<div class="input-group">
<input id="mc4wp_email" class="form-control input-newletter" name="EMAIL" required="required" type="email" placeholder="Enter your e-mail ..." />
<span class="input-group-btn">
<input class="btn btn-default" type="submit" value="SIGN UP" />
</span>
</div>
</div>